Premium
Soldering Grain Boundaries Yields Inverted Perovskite Solar Cells with Enhanced Open‐Circuit Voltages
Author(s) -
Li Yunlong,
Sun Weihai,
Gu Feidan,
Ouyang Dan,
Bian Zuqiang,
Liu Zhiwei,
Choy Wallace C. H.,
Kelly Timothy L.
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201900474
Subject(s) - materials science , perovskite (structure) , grain boundary , perovskite solar cell , crystallite , grain size , non blocking i/o , iodide , solar cell , open circuit voltage , formamidinium , optoelectronics , nanotechnology , chemical engineering , voltage , inorganic chemistry , composite material , metallurgy , electrical engineering , biochemistry , microstructure , chemistry , engineering , catalysis
Grain boundaries (GBs) are one of the major sources of defects in a polycrystalline perovskite solar cell and can greatly increase the rate of charge carrier recombination. In the push to optimize the efficiency of perovskite solar cells, it is therefore extremely important to maximize the grain size and minimize the number of GBs. In the present work, the number of GBs is effectively reduced by introducing a suitable number of formamidinium and chloride ions into the methylammonium lead iodide (MAPbI 3 ) absorber layer. Inverted perovskite solar cells, using NiO x nanocrystals as the low‐temperature‐fabricated hole transport layer, are prepared; the champion cell has an efficiency of 19.6%. This work demonstrates a simple method of minimizing the number of grain boundaries, which is critical to the future development of this technology.