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자료유형
학술저널
저자정보
Md. Abdul Kuddus Sheikh (Kookmin University) 압둘라임 (국민대학교) 손싱 (국민대학교) Jae-Hun Kim (국민대학교) Kyeong-Sik Min (Kookmin University) Jiyoung Kim (The University of Texas at Dallas) Jaegab Lee (Kookmin Univ.)
저널정보
대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.14 No.6
발행연도
2018.1
수록면
700 - 711 (12page)

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CdS synthesized by the chemical bath method at 70 °C, has been used as an electron transport layer in the planar structure ofthe perovskite solar cells. A two-step spin process produced a mixed halide perovskite of CH 3 NH 3 PbI 3−x Cl x and a mixtureof PbCl 2 and PbI 2 was deposited on CdS, followed by a sub-sequential reaction with MAI (CH 3 NH 3 I). The added PbCl 2 toPbI 2 in the fi rst spin-step aff ected the structure, orientation, and shape of lead halides, which varied depending on the contentof Cl. A small amount of Cl enhanced the surface morphology and the preferred orientation of PbI 2 , which led to largeand uniform grains of perovskite thin fi lms. In contrast, the high content of Cl produces a new phase PbICl in addition toPbI 2 , which leads to the small and highly uniform grains of perovskites. An improved surface coverage of perovskite fi lmswith the large and uniform grains maximized the performance of perovskite solar cells at 0.1 molar ratio of PbCl 2 to PbI 2 . The depth profi ling of elements in both lead halide fi lms and mixed halide perovskite fi lms were measured by Rutherfordbackscattering spectroscopy, revealing the distribution of chlorine along with the thickness, and providing the basis for themechanism for enhanced preferred orientation of lead halide and the microstructure of perovskites.

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