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Reduced Graphene Oxide/CZTS x Se 1‐x Composites as a Novel Hole‐Transport Functional Layer in Perovskite Solar Cells
Author(s) -
Nan Hui,
Han Jianhua,
Yin Xuewen,
Zhou Yu,
Yao Zhibo,
Li Xin,
Lin Hong
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801459
Subject(s) - czts , materials science , graphene , raman spectroscopy , energy conversion efficiency , x ray photoelectron spectroscopy , chemical engineering , perovskite (structure) , composite number , oxide , solar cell , optoelectronics , nanotechnology , composite material , metallurgy , optics , physics , engineering
Exploiting lower cost and more stable hole‐transport materials to replace spiro‐OMeTAD is a hot topic in the research field of perovskite solar cells (PSCs). This work exploits a novel hole‐transport composite containing reduced graphene oxides (RGO) and Cu 2 ZnSn(SSe) 4 (CZTS x Se 1‐x ) by a green sol‐gel method for efficient perovskite solar cells. The composition and crystalline structure of CZTS x Se 1‐x were examined by Raman and X‐ray photoelectron spectroscopy as well as by X‐ray diffraction measurements. Compared with a pristine RGO hole‐transport layer (HTL), the PSC with RGO/CZTS x Se 1‐x composite shows an improved photovoltaic performance and enhanced stability. A maximum power conversion efficiency (PCE) of 10.08 % and an enhanced stability were obtained for the cell with the RGO/CZTS 0.5 Se 0.5 composite. Moreover, only 14 % efficiency reduction ratio was observed for the device stored in air at room temperature after 500 hours without encapsulation. In addition, the different S/Se ratios of CZTS x Se 1‐x showed distinct photovoltaic properties of the PSCs, which is attributed to the change of energetic structures, confirmed by electrochemical characterizations.