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Schwarze, M., Tress, W., Beyer, B., Gao, F., Scholz, R., Poelking, C., . . . Leo, K. (2016). Band structure engineering in organic semiconductors. Science, 352(6292), 1446-1449.
Open this publication in new window or tab >>Band structure engineering in organic semiconductors
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2016 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 352, no 6292, 1446-1449 p.Article in journal (Refereed) Published
Abstract [en]

A key breakthrough in modern electronics was the introduction of band structure engineering, the design of almost arbitrary electronic potential structures by alloying different semiconductors to continuously tune the band gap and band-edge energies. Implementation of this approach in organic semiconductors has been hindered by strong localization of the electronic states in these materials. We show that the influence of so far largely ignored long-range Coulomb interactions provides a workaround. Photoelectron spectroscopy confirms that the ionization energies of crystalline organic semiconductors can be continuously tuned over a wide range by blending them with their halogenated derivatives. Correspondingly, the photovoltaic gap and open-circuit voltage of organic solar cells can be continuously tuned by the blending ratio of these donors.

Place, publisher, year, edition, pages
AMER ASSOC ADVANCEMENT SCIENCE, 2016
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-130126 (URN)10.1126/science.aaf0590 (DOI)000377975400045 ()27313043 (PubMedID)
Note

Funding Agencies|DFG [LE-747/44-1]; European Communitys Seventh Framework Programme [EP7-267995]; Knut and Alice Wallenberg Foundation through a Wallenberg Scholar grant; Swedish Research Council (VR) [330-2014-6433]; European Commission, Made Sklodowska-Curie Actions [INCA 600398]; Bundesministerium fur Bildung und Forschung [FKZ 03EK3503B]; Dr Isolde-Dietrich-Stiftung

Available from: 2016-07-12 Created: 2016-07-11 Last updated: 2017-11-28
Bai, S., Yuan, Z. & Gao, F. (2016). Colloidal metal halide perovskite nanocrystals: synthesis, characterization, and applications. Journal of Materials Chemistry C, 4(18), 3898-3904.
Open this publication in new window or tab >>Colloidal metal halide perovskite nanocrystals: synthesis, characterization, and applications
2016 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 4, no 18, 3898-3904 p.Article in journal (Refereed) Published
Abstract [en]

Colloidal metal halide perovskite nanocrystals (NCs) have emerged as promising materials for optoelectronic devices and received considerable attention recently. Their superior photoluminescence (PL) properties provide significant advantages for lighting and display applications. In this Highlight, we discuss recent developments in the design and chemical synthesis of colloidal perovskite NCs, including both organic-inorganic hybrid and all inorganic perovskite NCs. We review the excellent PL properties and current optoelectronic applications of these perovskite NCs. In addition, critical challenges that currently limit the applicability of perovskite NCs are discussed, and prospects for future directions are proposed.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2016
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-128980 (URN)10.1039/c5tc04116c (DOI)000375694900002 ()
Note

Funding Agencies|Swedish Research Council (VR); Swedish Research Council (FORMAS); European Commission Marie Sklodowska-Curie actions; Carl Tryggers Stiftelse; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]; China Scholarship Council

Available from: 2016-06-09 Created: 2016-06-07 Last updated: 2017-11-30
Zhao, W., Qian, D., Zhang, S., Li, S., Inganäs, O., Gao, F. & Hou, J. (2016). Fullerene-Free Polymer Solar Cells with over 11% Efficiency and Excellent Thermal Stability. Advanced Materials, 28(23), 4734-4739.
Open this publication in new window or tab >>Fullerene-Free Polymer Solar Cells with over 11% Efficiency and Excellent Thermal Stability
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2016 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 28, no 23, 4734-4739 p.Article in journal (Refereed) Published
Abstract [en]

A nonfullerene-based polymer solar cell (PSC) that significantly outperforms fullerene-based PSCs with respect to the power-conversion efficiency is demonstrated for the first time. An efficiency of amp;gt;11%, which is among the top values in the PSC field, and excellent thermal stability is obtained using PBDB-T and ITIC as donor and acceptor, respectively.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2016
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:liu:diva-130061 (URN)10.1002/adma.201600281 (DOI)000377531900023 ()27061511 (PubMedID)
Note

Funding Agencies|National Basic Research Program 973 [2014CB643501]; NSFC [91333204, 21325419]; Chinese Academy of Sciences [XDB12030200]; CAS-Croucher Funding Scheme for Joint Labs [CAS14601]; China Scholarship Council (CSC)

Available from: 2016-07-06 Created: 2016-07-06 Last updated: 2017-11-28
Wang, Y., Bai, S., Cheng, L., Wang, N., Wang, J., Gao, F. & Huang, W. (2016). High-Efficiency Flexible Solar Cells Based on Organometal Halide Perovskites. Advanced Materials, 28(22), 4532-4540.
Open this publication in new window or tab >>High-Efficiency Flexible Solar Cells Based on Organometal Halide Perovskites
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2016 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 28, no 22, 4532-4540 p.Article in journal (Refereed) Published
Abstract [en]

Flexible and light-weight solar cells are important because they not only supply power to wearable and portable devices, but also reduce the transportation and installation cost of solar panels. High-efficiency organometal halide perovskite solar cells can be fabricated by a low-temperature solution process, and hence are promising for flexible-solar-cell applications. Here, the development of perovskite solar cells is briefly discussed, followed by the merits of organometal halide perovskites as promising candidates as high-efficiency, flexible, and light-weight photovoltaic materials. Afterward, recent developments of flexible solar cells based on perovskites are reviewed.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2016
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:liu:diva-129659 (URN)10.1002/adma.201504260 (DOI)000377123500026 ()26669326 (PubMedID)
Note

Funding Agencies|National Basic Research Program of China-Fundamental Studies of Perovskite Solar Cells [2015CB932200]; Natural Science Foundation of Jiangsu Province, China [BK20131413, BK20140952, BM2012010]; National Natural Science Foundation of China [11474164, 61405091]; Specialized Research Fund for the Doctoral Program of Higher Education [20113223110005]; Synergetic Innovation Center for Organic Electronics and Information Displays; Jiangsu Specially Appointed Professor program; Swedish Research Council (VR); European Commission Marie Sklodowska-Curie actions

Available from: 2016-06-27 Created: 2016-06-23 Last updated: 2017-11-28
Li, G., Wisnivesky Rocca Rivarola, F., Davis, N. J. L., Bai, S., Jellicoe, T. C., de la Pena, F., . . . Tan, Z.-K. (2016). Highly Efficient Perovskite Nanocrystal Light-Emitting Diodes Enabled by a Universal Crosslinking Method. Advanced Materials, 28(18), 3528-+.
Open this publication in new window or tab >>Highly Efficient Perovskite Nanocrystal Light-Emitting Diodes Enabled by a Universal Crosslinking Method
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2016 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 28, no 18, 3528-+ p.Article in journal (Refereed) Published
Abstract [en]

The preparation of highly efficient perovskite nanocrystal light-emitting diodes is shown. A new trimethylaluminum vapor-based crosslinking method to render the nanocrystal films insoluble is applied. The resulting near-complete nanocrystal film coverage, coupled with the natural confinement of injected charges within the perovskite crystals, facilitates electron-hole capture and give rise to a remarkable electroluminescence yield of 5.7%.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2016
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:liu:diva-129165 (URN)10.1002/adma.201600064 (DOI)000376250600014 ()26990965 (PubMedID)
Note

Funding Agencies|EPSRC [EP/M005143/1, EP/J017361/1, EP/G037221/1]; Gates Cambridge Trust; CNPq [246050/2012-8]; ERC [259619 PHOTO-EM]; EU [312483 ESTEEM2]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [200900971]; Cambridge Commonwealth European and International Trust; Cambridge Australian Scholarships

Available from: 2016-06-13 Created: 2016-06-13 Last updated: 2017-11-28
Xia, Y., Musumeci, C., Bergqvist, J., Ma, W., Gao, F., Tang, Z., . . . Wang, E. (2016). Inverted all-polymer solar cells based on a quinoxaline-thiophene/naphthalene-diimide polymer blend improved by annealing. Journal of Materials Chemistry A, 4(10), 3835-3843.
Open this publication in new window or tab >>Inverted all-polymer solar cells based on a quinoxaline-thiophene/naphthalene-diimide polymer blend improved by annealing
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2016 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 10, 3835-3843 p.Article in journal (Refereed) Published
Abstract [en]

We have investigated the effect of thermal annealing on the photovoltaic parameters of all-polymer solar cells based on a quinoxaline-thiophene donor polymer (TQ1) and a naphthalene diimide acceptor polymer (N2200). The annealed devices show a doubled power conversion efficiency compared to nonannealed devices, due to the higher short-circuit current (J(sc)) and fill factor (FF), but with a lower open circuit voltage (V-oc). On the basis of the morphology-mobility examination by several scanning force microscopy techniques, and by grazing-incidence wide-angle X-ray scattering, we conclude that better charge transport is achieved by higher order and better interconnected networks of the bulk heterojunction in the annealed active layers. The annealing improves charge transport and extends the conjugation length of the polymers, which do help in charge generation and meanwhile reduce recombination. Photoluminescence, electroluminescence, and light intensity dependence measurements reveal how this morphological change affects charge generation and recombination. As a result, the J(sc) and FF are significantly improved. However, the smaller band gap and the higher HOMO level of TQ1 upon annealing causes a lower V-oc. The blend of an amorphous polymer TQ1, and a semi-crystalline polymer N2200, can thus be modified by thermal annealing to double the power conversion efficiency.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY, 2016
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-127066 (URN)10.1039/c6ta00531d (DOI)000371967000030 ()
Note

Funding Agencies|Swedish Energy Agency; Swedish Research council, NSFC [21504006, 21534003]; Knut and Alice Wallenberg Foundation through a Wallenberg scholar grant; China Scholarship Council (CSC); graduate student short-term abroad research project of Jinan University; program for the Excellent Doctoral Dissertations of Guangdong Province [ybzzxm201114]; U.S. Department of Energy [DE-AC02-05CH11231]

Available from: 2016-04-13 Created: 2016-04-13 Last updated: 2017-11-30
Bakulin, A. A., Xia, Y., Bakker, H. J., Inganäs, O. & Gao, F. (2016). Morphology, Temperature, and Field Dependence Separation in High-Efficiency Solar Cells Based on Polyquinoxaline Copolymer. The Journal of Physical Chemistry C, 120(8), 4219-4226.
Open this publication in new window or tab >>Morphology, Temperature, and Field Dependence Separation in High-Efficiency Solar Cells Based on Polyquinoxaline Copolymer
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2016 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 120, no 8, 4219-4226 p.Article in journal (Refereed) Published
Abstract [en]

Charge separation and recombination are key processes determining the performance of organic optoelectronic devices. Here we combine photoluminescence and photovoltaic characterization of organic solar cell devices with ultrafast multipulse photocurrent spectroscopy to investigate charge generation mechanisms in the organic photovoltaic devices based on a blend of an alternating polyquinoxaline copolymer with fullerene. The combined use of these techniques enables the determination of the contributions of geminate and bimolecular processes to the solar cell performance. We observe that charge separation is not a temperature-activated process in the studied materials. At the same time, the generation of free charges shows a dear external field and morphology dependence. This indicates that the critical step of charge separation involves the nonequilibrium state that is formed at early times after photoexcitation, when the polaronic localization is not yet complete. This work reveals new aspects of molecular level charge dynamics in the organic light-conversion systems.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2016
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-126807 (URN)10.1021/acs.jpcc.5b10801 (DOI)000371562000007 ()
Note

Funding Agencies|Netherlands Organization for Scientific Research (NWO) through the "Stichting voor Fundamenteel Onderzoek der Materie" (FOM); VENI grant from NWO; Swedish Research Council (VR); European Commission Marie Sklodowska-Curie actions; Swedish Energy Agency; Knut and Alice Wallenberg foundation (KAW)

Available from: 2016-04-07 Created: 2016-04-05 Last updated: 2017-11-30
Li, Y., Liu, X., Wu, F.-P., Zhou, Y., Jiang, Z.-Q., Song, B., . . . Liao, L.-S. (2016). Non-fullerene acceptor with low energy loss and high external quantum efficiency: towards high performance polymer solar cells. Journal of Materials Chemistry A, 4(16), 5890-5897.
Open this publication in new window or tab >>Non-fullerene acceptor with low energy loss and high external quantum efficiency: towards high performance polymer solar cells
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2016 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 4, no 16, 5890-5897 p.Article in journal (Refereed) Published
Abstract [en]

A non-fullerene electron acceptor bearing a fused 10-heterocyclic ring (indacenodithiophenoindacenodithiophene) with a narrow band gap (similar to 1.5 eV) was designed and synthesized. It possesses excellent planarity and enhanced effective conjugation length compared to previously reported fused-ring electron acceptors. When this acceptor was paired with PTB7-Th and applied in polymer solar cells, a power conversion efficiency of 6.5% was achieved with a high open circuit voltage of 0.94 V. More significantly, an energy loss as low as 0.59 eV and an external quantum efficiency as high as 63% were obtained simultaneously.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-128773 (URN)10.1039/c6ta00612d (DOI)000374790700016 ()
Note

Funding Agencies|National Natural Science Foundation of China [21504062, 21202114, 21204054, 51303118, 91333204]; Natural Science Foundation of Jiangsu Province [BK20130289]; China Postdoctoral Science Foundation Funded Project [2015M581853]; Jiangsu Province Postdoctoral Science Foundation Funded Project [1501024B]; Priority Academic Program Development of Jiangsu Higher Education Institutions; Programs Foundation of the Ministry of Education of China [20133201120008]; Beijing National Laboratory for Molecular Sciences [20140112]; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials; CSC; Open Research Fund of State Key Lab of Silicon Materials (Zhejiang University); Knut and Alice Wallenberg foundation; Science Council, Sweden

Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2017-11-30
Peng, Z., Xia, Y., Gao, F., Xiong, K., Hu, Z., Ian James, D., . . . Hou, L. (2015). A dual ternary system for highly efficient ITO-free inverted polymer solar cells. Journal of Materials Chemistry A, 3(36), 18365-18371.
Open this publication in new window or tab >>A dual ternary system for highly efficient ITO-free inverted polymer solar cells
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2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 36, 18365-18371 p.Article in journal (Refereed) Published
Abstract [en]

In this study, it has been found that a very fine nanostructure can be realized by mixing 1-chloronaphthalene (CN) - a high-boiling solvent into a binary chlorobenzene (CB) : 1,8-diiodooctane (DIO) solvent mixture to form a ternary solvent system. An improvement in energy level alignment is also obtained by doping ICBA into a binary PTB7 : PCBM[70] blend, whereby the ternary solute system provides a new pathway for charge transfer from PTB7 to the PCBM[ 70] : ICBA alloy. This is confirmed by imaging the surface morphology of the active layer using AFM and TEM, monitoring the transient film formation process and measuring the charge transfer states with Fourier transform photocurrent spectroscopy. An encouraging PCE of 7.65% is achieved from the dual ternary system, which is the highest value ever reported for an ITO-free inverted polymer solar cell with a PEDOT:PSS layer as the top semitransparent electrode - a system which is compatible with low-cost large-area roll-to-roll manufacturing.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2015
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-121444 (URN)10.1039/c5ta03831f (DOI)000360490600005 ()
Note

Funding Agencies|NSFC Project [11204106, 61274062, 21225418]; Open Fund of State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2012-skllmd-10, 2013-skllmd-06, 2015-skllmd-02]; Fundamental Research Fund for Central Universities; Swedish Research Council (VR); Excellent Doctoral Dissertations of Guangdong Province [ybzzxm201114]

Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2017-12-04
Li, X., Zhang, W., Wang, X., Wu, Y., Gao, F. & Fang, J. (2015). Critical role of the external bias in improving the performance of polymer solar cells with a small molecule electrolyte interlayer. Journal of Materials Chemistry A, 3(2), 504-508.
Open this publication in new window or tab >>Critical role of the external bias in improving the performance of polymer solar cells with a small molecule electrolyte interlayer
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2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 2, 504-508 p.Article in journal (Refereed) Published
Abstract [en]

A small-molecule electrolyte based on the popular ethylene diamine tetraacetic acid (EDTA-N) is introduced as an efficient cathode interlayer in inverted polymer solar cells, helping to deliver power conversion efficiency over 9%. The strong dependence of device performance on the external bias suggests that the ion motion plays a critical role in improving the performance of devices with electrolyte interlayers.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2015
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-113160 (URN)10.1039/c4ta05516k (DOI)000346082100006 ()
Note

Funding Agencies|National Natural Science Foundation of China [61474125, 51273208]; Zhejiang Provincial Natural Science Foundation of China [LR14E030002]; Hundred Talent Program of Chinese Academy of Sciences; European Commission under a Marie Curie Intra-European Fellowship for Career Development

Available from: 2015-01-14 Created: 2015-01-12 Last updated: 2017-12-05
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ORCID iD: ORCID iD iconorcid.org/0000-0002-2582-1740

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