Advanced Energy Materials
Advanced Energy Materials
5 years ago

Synergic Interface Optimization with Green Solvent Engineering in Mixed Perovskite Solar Cells

Synergic Interface Optimization with Green Solvent Engineering in Mixed Perovskite Solar Cells
Xinxin Yu, Jie Zhong, Song Wang, Saisai Li, Lan Wu, Tongle Bu, Peng Zhou, Yong Peng, Xiaokun Yang, Xueping Liu, Yi-Bing Cheng, Zhiliang Ku, Jiangjian Shi, Qingbo Meng, Fuzhi Huang, Tianshi Qin
Organic–inorganic hybrid halide perovskite solar cells (PSCs) have recently drawn enormous attentions due to their impressive performance (>22%) and low temperature solution processability (<150 °C). Current solution process involves application of a large amount of toxic solvents, such as chlorobenzene, which is heavily employed in both the perovskite layer and the hole transport layer (HTL) deposition. Herein, this study employs green solvent of ethyl acetate for engineering efficient perovskite and HTL layers, which enables a synergic interface (perovskite/HTL) optimization. A champion efficiency of 19.43% is obtained for small cells (0.16 cm2 with mask) and over 14% for large size modules (5 × 5 cm2). The PSCs prepared from the green solvent engineering demonstrate superior performance on both efficiency and stability over their chlorobenzene counterparts. These enhancements are ascribed to the in situ inhibition on carrier recombination induced by interfacial defects during the solution processing, which enables about 2/3 reduction of calculated recombination rate. Thus, the green solvent route shows the great potential toward environmental-friendly manufacturing. The widely used toxic chlorobenzene for the perovskite and Spiro-OMeTAD film processing is replaced by a green solvent of ethyl acetate. This green solvent engineering produces pinhole-free films of both the perovskite and Spiro-OMeTAD hole transport layer. Via the synergic interface optimization, an impressive power conversion efficiency up to 19.43% is achieved.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700576

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