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Precisely Controlling the Grain Sizes with an Ammonium Hypophosphite Additive for High-Performance Perovskite Solar Cells
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Nanjing Univ Posts and Telecommun, Peoples R China; Nanjing Univ Posts and Telecommun, Peoples R China; Nanjing Tech Univ NanjingTech, Peoples R China; Nanjing Tech Univ NanjingTech, Peoples R China.
Nanjing Univ Posts and Telecommun, Peoples R China; Nanjing Univ Posts and Telecommun, Peoples R China.
Wuhan Univ, Peoples R China.
Nanjing Univ Posts and Telecommun, Peoples R China; Nanjing Univ Posts and Telecommun, Peoples R China.
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2018 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 28, no 33, article id 1802320Article in journal (Refereed) Published
Abstract [en]

A facile approach to precisely control the perovskite grain sizes is proposed and demonstrated for high-performance photovoltaic (PV) solar cells. With the introduction of various amounts of NH4H2PO2 (AHP) additives into the PbI2/CH3NH3I precursors, the grain scale of CH3NH3PbI3 films can be finely turned from hundreds of nanometer to micrometer scale, allowing evaluating the effects of crystalline grain boundary on trap densities, charge recombination, and PV device performance. The X-ray diffraction and X-ray photoelectron spectroscopy measurements indicate that the formation of intermediates plays a key role in assisting the perovskite crystal growth. The optimized devices show much larger open-circuit voltages (V-OC) up to 1.10 +/- 0.02 V and significantly enhance power conversion efficiencies (PCEs) of 16.5 +/- 0.7%, as compared to the control devices with PCE of 9.4 +/- 1.0% and V-OC of 1.00 +/- 0.03 V. Further investigations confirm that the boosted PV performance origins from the decreased defect densities due to enlarged grain sizes. It is also demonstrated that the approach is general and applicable to other perovskite systems, e.g., HC(NH2)(2)PbI3. The results suggest the promising application of AHP in achieving high-performance perovskite PV devices, and shed light on understanding the grain boundary effects on perovskite optoelectronics.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 28, no 33, article id 1802320
Keywords [en]
ammonium hypophosphite additives; crystal growth; crystalline grain boundary; perovskite; perovskite solar cells
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Identifiers
URN: urn:nbn:se:liu:diva-151954DOI: 10.1002/adfm.201802320ISI: 000445192400022OAI: oai:DiVA.org:liu-151954DiVA, id: diva2:1256331
Note

Funding Agencies|National Key Basic Research Program of China (973 Program) [2014CB648300, 2017YFB0404501]; National Natural Science Foundation of China [21674050, 21422402, 61704077]; Natural Science Foundation of Jiangsu Province [BK20140060, BK20171007, BM2012010]; Program for Jiangsu Specially-Appointed Professors [RK030STP15001]; 333 Project of Jiangsu Province [BRA2017402]; China Postdoctoral Science Foundation [2016M601784, 2017T100358]; Synergetic Innovation Center for Organic Electronics and Information Displays; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD); NUPT "1311 Project"; Scientific Foundation [NY217169]; Leading Talent of Technological Innovation of National Ten-Thousands Talents Program of China; Excellent Scientific and Technological Innovative Teams of Jiangsu Higher Education Institutions [TJ217038]; NUPTSF [NY216025, NY217073]; Innovation Program for Ordinary Higher Education Graduate of Jiangsu Province of China [CXZZ12_0458]; Swedish Research Council (FORMAS) [942-2015-1253]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]; Vinnova [2016-02051]

Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2018-10-16

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