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손싱,Rahim Abdur,남호석,Jae-Hun Kim,이성민,이현승,이재갑 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.3
In this study, a (3-aminopropyl) triethoxysilane (APTES) monolayer was used as an adhesion promoter to assemble presynthesizedSnO 2 nanocrystal (NC) arrays for use as electron transport layers (ETLs) in perovskite solar cells. The selfassembledmonolayers on indium tin oxide (ITO) bottom electrodes interact with the SnO 2 NCs via covalent bonding duringthe spin-coating process, leading to the formation of pinhole-free SnO 2 NC layers, which enabled the growth of perovskitefi lms with uniform microstructures. The device performance analyses showed that the resulting photovoltaic effi ciencysignifi cantly increased from 10.68% to 15.52% with the use of the APTES monolayer. This increase in the photovoltaiceffi ciency can be attributed to the reduction in defects at the ETL/perovskite interface and in the bulk. This paper presents afacile, robust, and eff ective strategy to improve the grafting of SnO 2 NCs on fl at ITO substrates by using APTES, and thus,increase the quality of the ETL/perovskite interfacial structure.
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Md. Abdul Kuddus Sheikh,압둘라임,손싱,Jae-Hun Kim,Kyeong-Sik Min,Jiyoung Kim,Jaegab Lee 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.6
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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