Morphology control of perovskite in green antisolvent system for MAPbI3-based solar cells with over 20% effciency

Title
Morphology control of perovskite in green antisolvent system for MAPbI3-based solar cells with over 20% effciency
Authors
한일기강구민Soyoung KimInyoung JeongCheolwoo ParkWooyul KimMinwoo Park
Issue Date
2019-12
Publisher
Solar energy materials and solar cells
Citation
VOL 203-110197-1
Abstract
Solvent engineering has been considered a reliable process for the fabrication of pinhole-free and highly crystalline perovskite thin films. Recently, green solvents have received immense attention, as the toxic antisolvents used in the conventional fabrication process cause environmental and health hazards. In this regard, ethyl acetate (EA) is a promising environmentally friendly antisolvent. Here, we present the fabrication of perovskites with controlled morphologies by changing the composition of the perovskite and the volume of EA in ambient humidity. The incorporation of [HC(NH2)2]PbIBr2 into a CH3NH3PbI3 matrix results in a grain size up to ~1.5  μm. This induces a considerable reduction of trap density, leading to the suppression of charge recombination and, consequently, improvement in the photoluminescence characteristics. The resulting power conversion efficiencies (PCEs) of the optimized devices are 20.93% and 19.51% for active areas of 0.12  cm2 and 0.7  cm2, respectively. The reduced diffusion of moisture along grain boundaries improves device stability. Further, by virtue of the excellent humidity resistance of EA, the film morphologies obtained at high relative humidity (50%) are similar to those obtained under dry conditions, exhibiting an impressive PCE of 20.11%. We believe that our optimized fabrication process using EA can be extended to other green antisolvent systems.
URI
http://pubs.kist.re.kr/handle/201004/70439
ISSN
0927-0248
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KIST Publication > Article
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