Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 28, Pages 9414-9418Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201902984
Keywords
electron lifetime; interfaces; open circuit voltage; perovskite solar cells; rutile TiO2
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Funding
- National Natural Science Foundation of China [21590795, 21820102002, 51802306]
- Scientific Instrument Developing Project of the Chinese Academy of Sciences [YZ201623]
- Queensland-Chinese Academy of Sciences Collaborative Science Fund [122111KYSB20170001]
- Chinese Academy of Sciences (CAS) Interdisciplinary Innovation Team
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Interfacial charge collection efficiency has demonstrated significant effects on the power conversion efficiency (PCE) of perovskite solar cells (PSCs). Herein, crystalline phase-dependent charge collection is investigated by using rutile and anatase TiO2 electron transport layer (ETL) to fabricate PSCs. The results show that rutile TiO2 ETL enhances the extraction and transportation of electrons to FTO and reduces the recombination, thanks to its better conductivity and improved interface with the CH3NH3PbI3 (MAPbI(3)) layer. Moreover, this may be also attributed to the fact that rutile TiO2 has better match with perovskite grains, and less trap density. As a result, comparing with anatase TiO2 ETL, MAPbI(3) PSCs with rutile TiO2 ETL delivers significantly enhanced performance with a champion PCE of 20.9% and a large open circuit voltage (V-OC) of 1.17V.
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