Cu gradient design to attain high efficient solution-processed CuIn(S,Se)2 solar cells

IF 13.1 1区 化学 Q1 Energy
Xuejun Xu, Rutao Meng, Yue Liu, Han Xu, Jianpeng Li, Yi Zhang
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Abstract

Solution-processed chalcopyrite solar cells are widely regarded as a promising alternative method in reducing the cost compared with vacuum-based techniques. It is noted that the absorber layer usually needs to be prepared under a high insert pressure (∼1.6 atm) to suppress element loss or under a mild pressure but additional surface etching is needed for fabricating high efficient solar cell. Herein, a copper gradient structured precursor is proposed to prepare CuIn(S,Se)2 (CISSe) film under a mild pressure (1.1 atm). The designed gradient Cu not only promotes crystal grain growth and tailors the defects, but also avoids the surface etching of the formed CISSe film for the fabrication of high efficient solar cells. Further, Cu gradient design decreases the conduction band offset of heterojunction, boosting the carriers transport across the p-n heterojunction. Accordingly, a 13.35% efficient CISSe solar cell, comparable to the high efficient CISSe solar cell prepared by this method under high pressure or with film surface etching, is fabricated. This work provides a facile pathway to fabricate high efficient solution-processed chalcopyrite solar cell, avoiding high selenization pressure and film etching, and shows huge potential for solution-processed copper-based solar cells.

Abstract Image

通过铜梯度设计实现高效溶液法 CuIn(S,Se)2 太阳能电池
与真空技术相比,溶液处理黄铜矿太阳能电池被广泛认为是降低成本的一种有前途的替代方法。人们注意到,吸收层通常需要在较高的插入压力(∼1.6 atm)下制备以抑制元素损失,或者在温和的压力下制备,但要制造高效太阳能电池还需要额外的表面蚀刻。本文提出了一种铜梯度结构前驱体,用于在温和的压力(1.1 atm)下制备 CuIn(S,Se)2 (CISSe) 薄膜。设计的梯度铜不仅能促进晶粒生长,调整缺陷,还能避免对已形成的 CISSe 薄膜进行表面蚀刻,从而制造出高效太阳能电池。此外,铜梯度设计降低了异质结的导带偏移,促进了载流子在 p-n 异质结上的传输。因此,我们制备出了效率为 13.35% 的 CISSe 太阳能电池,与在高压或薄膜表面蚀刻条件下采用该方法制备的高效 CISSe 太阳能电池不相上下。这项工作为制备高效溶液法黄铜矿太阳能电池提供了一条简便的途径,避免了高硒化压力和薄膜蚀刻,显示了溶液法铜基太阳能电池的巨大潜力。
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来源期刊
Journal of Energy Chemistry
Journal of Energy Chemistry CHEMISTRY, APPLIED-CHEMISTRY, PHYSICAL
CiteScore
19.10
自引率
8.40%
发文量
3631
审稿时长
15 days
期刊介绍: The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies. This journal focuses on original research papers covering various topics within energy chemistry worldwide, including: Optimized utilization of fossil energy Hydrogen energy Conversion and storage of electrochemical energy Capture, storage, and chemical conversion of carbon dioxide Materials and nanotechnologies for energy conversion and storage Chemistry in biomass conversion Chemistry in the utilization of solar energy
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