PUBLICATIONS

Advanced Devices for Energy Conversion

Journals

Journal of Materials Chemisrty A
년도 2018
학술지명 Journal of Materials Chemisrty A
논문명 Effects of temperature and coating speed on the morphology of solution-sheared halide perovskite thin-films
게재권/집 6/48
수록페이지 24911
저자명 Min Kyu Kim, Hyeon Seok Lee, Seong Ryul Pae, Dong-Jun Kim, Jung-Yong Lee, Issam Gereige, Steve Park*, and Byungha Shin*
Link 관련링크 https://doi.org/10.1039/C8TA08565J 606회 연결

Abstract


In this work, we have conducted a systematic study of the crystallization of perovskite thin-films during solution-shearing to elucidate how parameters such as substrate temperature and coating speed influence the morphology of the thin-film. Four distinct phases are identified and a morphological phase map is constructed. The formation of these phases is attributed to a delicate balance between the degree and rate of supersaturation and the flux of solution supply to the meniscus line, which dictates the nucleation and the crystal growth process. An optimal phase window is identified and the photovoltaic device under the chosen conditions exhibits a power conversion efficiency over 15%, which is comparable to that of a reference device prepared by the conventional spin-coating process. Furthermore, a large area perovskite film of 57 cm2 is prepared. Small-area devices from different locations within the large-area film show uniform efficiencies with a deviation coefficient of 4.2%, demonstrating the high uniformity of the thin-film.