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Benzylamine-Treated Wide-Bandgap Perovskite with High Thermal-Photostability and Photovoltaic Performance
Chinese University of Hong Kong, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Nanjing Technical University, Peoples R China.
Nanjing Technical University, Peoples R China.
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2017 (English)In: ADVANCED ENERGY MATERIALS, ISSN 1614-6832, Vol. 7, no 22, article id 1701048Article in journal (Refereed) Published
Abstract [en]

Mixed iodide-bromide organolead perovskites with a bandgap of 1.70-1.80 eV have great potential to boost the efficiency of current silicon solar cells by forming a perovskite-silicon tandem structure. Yet, the stability of the perovskites under various application conditions, and in particular combined light and heat stress, is not well studied. Here, FA(0.15)Cs(0.85)Pb(I0.73Br0.27)(3), with an optical bandgap of approximate to 1.72 eV, is used as a model system to investigate the thermal-photostability of wide-bandgap mixed halide perovskites. It is found that the concerted effect of heat and light can induce both phase segregation and decomposition in a pristine perovskite film. On the other hand, through a postdeposition film treatment with benzylamine (BA) molecules, the highly defective regions (e.g., film surface and grain boundaries) of the film can be well passivated, thus preventing the progression of decomposition or phase segregation in the film. Besides the stability improvement, the BA-modified perovskite solar cells also exhibit excellent photovoltaic performance, with the champion device reaching a power conversion efficiency of 18.1%, a stabilized power output efficiency of 17.1% and an open-circuit voltage (V-oc) of 1.24 V.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2017. Vol. 7, no 22, article id 1701048
Keywords [en]
passivation; photostability; solar cells; thermal stability; wide-bandgap perovskites
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:liu:diva-143939DOI: 10.1002/aenm.201701048ISI: 000417350000028OAI: oai:DiVA.org:liu-143939DiVA, id: diva2:1169770
Note

Funding Agencies|Theme-based Research Scheme from the Research Grants Council of Hong Kong [T23-407/13-N]

Available from: 2017-12-29 Created: 2017-12-29 Last updated: 2017-12-29

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  • apa
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