High Performance Perovskite Solar Cells through Surface Modification, Mixed Solvent Engineering and Nanobowl-Assisted Li
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High Performance Perovskite Solar Cells through Surface Modification, Mixed Solvent Engineering and Nanobowl-Assisted Light Harvesting Xianghong He1,2, Yang Bai1, Haining Chen1, Xiaoli Zheng1 and Shihe Yang1* 1
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong. 2 School of Chemistry and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu 213001, China. *corresponding author email: [email protected]
ABSTRACT In spite of the phenomenal efficiency progression of the organometal halide perovskite-based solar cells (PSCs) over the past few years, detailed understanding of the working mechanisms and effective measures to overcome the main weaknesses such as the long-term instability are of central importance. This paper provides a brief review of our most recent research on high-performance PSCs including the diethanolamine-modification of NiO surface, the mixed solvent engineering and the mesoporous TiO2 nanobowl (NB) array assisted light harvesting.
INTRODUCTION There are now three main categories of device architectures for organic−inorganic hybrid perovskite-based solar cells (PSCs) including the meso-structured, planar (thin-film n-i-p or p-i-n) and hole-conductor free devices.1The past few years have seen an overwhelming surge in the meso-structured and thin-film planar PSCs due to their superior photovoltaic properties such as broad light absorption spectra range, high extinction coefficient, long charge-carrier diffusion length, and ambipolar transport.2–6 Although the power conversion efficiency (PCE) has reached 20.1% in single cells and 13% in large area modules late last year,7 such solar cells are still far from moving into the market. For their practical deployment, the module efficiency needs to be further increased and more importantly, the cell instability problem needs to be resolved.8-14 Great efforts have been spent towards these directions.4,6,15-24 For example, approaches to improve the efficiency attempt to either extend the optical-absorption range, or enhance charge-carrier extraction.12,15,16 Moreover, further efficiency enhancements are expected following optimization of corresponding interfacial engineering.17 As for improving the stability, one simple way is to protect the perovskite from water molecule attachment by utilizing an interfacial coating layer such as metal oxides and carbon materials.18-21 The other approach is to improve intrinsic stability of the perovskite by tailoring the composition and morphology of the perovskite film.22 In addition, perovskite grain crystal
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crosslinking is a promising strategy to increase their stability.23 In fact, just as indicated by Wang’s group, in aim to modulate the stability of PSCs, the following factors should be taken into
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