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The Positive Function of Incorporation of Small Molecules into Perovskite Materials for High‐Efficient Stable Solar Cells
Author(s) -
Azam Muhammad,
Liu Kong,
Yue Shizhong,
Sun Yang,
Zhang Dongyang,
Hassan Ali,
Wang Zhijie,
Zhou Huiqiong,
Qu Shengchun,
Wang Zhanguo
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201800327
Subject(s) - perovskite (structure) , materials science , passivation , crystallization , hysteresis , energy conversion efficiency , molecule , grain boundary , non radiative recombination , phase (matter) , chemical engineering , nanotechnology , layer (electronics) , optoelectronics , chemistry , microstructure , organic chemistry , composite material , semiconductor , physics , quantum mechanics , semiconductor materials , engineering
The additive engineering to hybrid organic‐inorganic perovskite precursors is an effective technique toward highly efficient stable photovoltaic devices, however, there is still a deficiency in fundamental understanding on how these additives affect the perovskite film and device performance as well. Herein is introduced a small organic molecule, DRCN5T, into a double‐cation perovskite precursor and the function on device performance is systematically investigated. An appropriate amount of DRCN5T into the precursor can promote the crystallization of film with successful suppression of δ‐FAPbI 3 phase, reduce grain boundaries and adequately passivate the native defect sites. In addition, the incorporation of DRCN5T also regulates the energy level alignment of the perovskite to charge transport layer suitably. This leads to the promotion of charge transport, reduction in non‐radiative recombination, and boosts the efficiency to a value of 20.60% with greatly reduced hysteresis in the device. Moreover, the treatment by DRCN5T also significantly increases the stability of the devices in ambient environment. These findings open the gate to produce highly crystallized perovskite/organic‐molecule active layers toward commercialization of perovskite solar cells.