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ZnO 박막의 표면 거칠기 감소에 따른 역구조 유기태양전지의 효율 향상
최규채 ( Kyu Chae Choi ),이은진 ( Eun Jin Lee ),김민지 ( Min Ji Kim ),백연경 ( Youn Kyung Beak ),신평우 ( Puyng Woo Shin ),김양도 ( Yang Do Kim ),김영국 ( Young Kuk Kim ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.10
This paper describes an inverted bulk heterojunction organic solar cell featuring solution-processed zinc oxide nanoparticles (ZnO NPs) as the electron transport layer. ZnO NPs with an average diameter of ~5 nm are synthesized by a wet chemistry method. The ZnO NP layers are deposited from colloidal ZnO NPs dispersed in a mixed solvent having various volumetric ratios of chlorobenzene (CB) and isopropyl alcohol (IPA). After the coating step, the surface roughness of the coating films was reduced and that was related to the dispersion of the ZnO NP solution. The maximum performance of the solar cell was achieved when the ZnO NPs were suspended within a volumetric ratio (50 vol%:50 vol%) of CB and IPA, with a solar power conversion efficiency of 3.74% at AM 1.5 G, 100 mW/cm2 illumination.