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A Fast Deposition‐Crystallization Procedure for Highly Efficient Lead Iodide Perovskite Thin‐Film Solar Cells
Author(s) -
Xiao Manda,
Huang Fuzhi,
Huang Wenchao,
Dkhissi Yasmina,
Zhu Ye,
Etheridge Joanne,
GrayWeale Angus,
Bach Udo,
Cheng YiBing,
Spiccia Leone
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201405334
Subject(s) - materials science , perovskite (structure) , thin film , crystallization , iodide , energy conversion efficiency , chemical engineering , deposition (geology) , photovoltaics , solar cell , chlorobenzene , spin coating , layer (electronics) , optoelectronics , nanotechnology , photovoltaic system , inorganic chemistry , chemistry , organic chemistry , catalysis , paleontology , ecology , sediment , engineering , biology
Thin‐film photovoltaics based on alkylammonium lead iodide perovskite light absorbers have recently emerged as a promising low‐cost solar energy harvesting technology. To date, the perovskite layer in these efficient solar cells has generally been fabricated by either vapor deposition or a two‐step sequential deposition process. We report that flat, uniform thin films of this material can be deposited by a one‐step, solvent‐induced, fast crystallization method involving spin‐coating of a DMF solution of CH 3 NH 3 PbI 3 followed immediately by exposure to chlorobenzene to induce crystallization. Analysis of the devices and films revealed that the perovskite films consist of large crystalline grains with sizes up to microns. Planar heterojunction solar cells constructed with these solution‐processed thin films yielded an average power conversion efficiency of 13.9±0.7 % and a steady state efficiency of 13 % under standard AM 1.5 conditions.