이중주입 초음파분무법에 의한 메틸암모늄 할로젠화 납 페로브스카이트 박막의 제조
Preparation of methylammonium lead halide perovskite thin films by dual feed ultrasonic spray method
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초록
본 연구에서는 페로브스카이트 태양전지의 광흡수체로 사용되는 메틸암모늄 할로젠화 납(methylammonium lead halide, MAPbX3, X = I, Br) 페로브스카이트(perovskite) 박막을 이중주입 초음파분무법을 이용하여 제조하였다. 이중주입 초음파 분무법을 통해 60 o C 이하의 기판온도에서 분무한 후, 75 o C에서 5분간 최종열처리 후 MAPbI3 단일상을 제조할 수 있었다. 80 o C 이상의 온도에서 분무 증착 시에는 페로브스카이트 상의 분해로 인해 구형의 결정립이 막대형태의 프렉탈(fractal) 구조로 변화되었다. MAPbI3 용액과 MAPbIBr2 용액의 이중주입을 통해, MAPbI3 박막에 비해 높은 100 o C의 열처리로 MAPbI3−xBrx 박막을 제조할 수 있었다.
Abstract
Methylammonium lead halide (MAPbX3, X = I, Br) thin films, used as the light absorber of perovskite solar cells, were prepared using the dual feed ultrasonic spray method. Going through a deposition at a substrate temperature of below 60 o C and then a final heat treatment at 75 o C for 5 minutes using dual feed ultrasonic spray method, MAPbI3 single phase could be formed. Whereas undergoing a deposition at temperatures above 80 o C, the spheroidal grains could be changed into rod-shaped fractal structures due to the decomposition of the perovskite phase. Furthermore, using the same method at a higher heat treatment temperature of 100 o C, MAPbI3−xBrx thin films could also be formed from MAPbI3 and MAPbIBr2 solution.
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