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One‐step Solution‐Processed Formamidinium Lead Tribromide Formation for Better Reproducible Planar Perovskite Solar Cells
Author(s) -
Das Jaykrushna,
Subbiah Anand S.,
Mahuli Neha,
Singh Roja,
Sarkar Shaibal K.
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700362
Subject(s) - formamidinium , materials science , perovskite (structure) , energy conversion efficiency , crystallinity , solution process , heterojunction , crystallization , photoactive layer , perovskite solar cell , optoelectronics , hysteresis , chemical engineering , tribromide , layer (electronics) , open circuit voltage , photovoltaic system , nanotechnology , inorganic chemistry , polymer solar cell , chemistry , voltage , composite material , physics , quantum mechanics , engineering , ecology , biology
Low‐cost solar cells based on solution‐processed organic–inorganic hybrid perovskites with high photovoltage are highly sought after, especially for their use in tandem cells or for driving electrochemical reactions. Towards this end, we herein present a single‐step method for the preparation of regular planar heterojunction solar cells based on formamidinium lead tribromide (FAPbBr 3 ), which is fabricated through an antisolvent‐assisted crystallization process. This results in the formation of improved film quality of the perovskite layer in terms of uniformity, surface coverage, crystallinity, and light absorption. Devices fabricated using such films utilizing 2,2′,7,7′‐tetrakis‐( N , N ‐ p ‐dimethoxyphenylamino)‐9,9′‐spirobifluorene (spiro‐OMeTAD) as the hole‐transport layer exhibits an open‐circuit voltage ( V oc ) of 1.32 V with a power conversion efficiency (PCE) close to 6 %. The device performance is much higher than when using devices based on the conventional one‐step process (i.e., without using an antisolvent), where a V oc of 1.04 V and a PCE of 1.1 % are obtained. Moreover, the devices show better reproducibility with very little hysteresis.