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Highly Efficient Planar Perovskite Solar Cells Via Interfacial Modification with Fullerene Derivatives
Author(s) -
Dong Yang,
Li Wenhua,
Zhang Xuejuan,
Xu Qian,
Liu Qian,
Li Cuihong,
Bo Zhishan
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201503361
Subject(s) - perovskite (structure) , materials science , monolayer , fullerene , quenching (fluorescence) , open circuit voltage , heterojunction , planar , chemical engineering , layer (electronics) , energy conversion efficiency , optoelectronics , nanotechnology , fluorescence , voltage , chemistry , organic chemistry , optics , physics , computer graphics (images) , quantum mechanics , computer science , engineering
Planar heterojunction perovskite solar cells with a high efficiency up to 17.76% are fabricated by modifying the compact TiO 2 (c‐TiO 2 ) with a [6,6]‐phenyl‐C 61 ‐butyric acid (PCBA) monolayer. High quality CH 3 NH 3 PbI 3 films can be easily fabricated on PCBA‐modified c‐TiO 2 substrates by a one‐step solution processing method. Significant improvements of the device parameters are observed after PCBA modification. A high open‐circuit voltage ( V oc ) of 1.16 V has been achieved, indicating that the PCBA monolayer can act as a hole blocking layer to reduce the trap site density atop the c‐TiO 2 and the hole recombination at the c‐TiO 2 /perovskite interface. The enhancement of the fill factor, as well as the partial quenching of the fluorescence of perovskite after modification with PCBA, reveals that the charge extraction is improved.