石墨烯/硅肖特基结界面优化研究进展

doi:10.11896/cldb.20080040

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Abstract Among all kinds of commercial solar cells, traditional silicon-based solar cells occupy a leading position in the global photovoltaic market due to their advantages such as abundant raw materials and mature production technology etc. However, the production of traditional silicon-based solar cells requires high temperature diffusion or ion implantation to form p-n junction, leading to the higher cost than conventional energy. Moreover, this process consumes high energy and causes environmental pollution, contradicting the goal of clean energy. Therefore, to further reduce the cost of photovoltaic power generation has been the goal that people are pursuing.
Recent years, graphene/silicon (Gr/Si) Schottky junction solar cells have attracted much attention because of its simple technology and potential for low-cost device fabrication. With the characteristics of high light transmittance and good electrical conductivity, graphene can be used as the active layer and transparent electrode for the separation of photogenerated carriers in such solar cells. Moreover, the electrical conductivity of graphene can be improved by chemical doping or increasing the number of graphene film layers. At present, through the introduction of interface engineering, chemical doping, antireflection film and other technologies, the conversion efficiency of graphene/silicon (Gr/Si) Schottky junction solar cells has increased from 1.65% to 16.61% (closing to the level of traditional silicon-based solar cells), showing great potential for development. However, there are a large number of suspension bonds and defects exist on the silicon surface, these surface states can act as electron capture and recombination centers. This characteristic greatly increases the recombination rate of the silicon surface carriers, resulting in pinning of Fermi level and reduction of Schottky potential barrier, which is not conducive to the improvement of device performance. The optimization scheme of cell performance through optimizing the Gr/Si interface, reducing the interface recombination and improving the cell open-circuit voltage (V_OC) has become one of the current research hotspots.
In this paper, the main Gr/Si interface optimization mechanisms and research progress, such as passivation of insulating layer, passivation of chemical groups on silicon surface and insertion of hole transport layer are systematically summarized, which provides a certain reference and guidance for the preparation of high efficiency and high stability graphene/silicon Schottky solar cells.

Key words： graphene silicon Schottky junction solar cell interface optimization

Published: 10 November 2022 Online: 2022-11-03

CLC number:

TM914.4

Fund:National Natural Science Foundation of China(61764009, 51762043, 51974143), National Key R & D Program of China(2018YFC1901801, 2018YFC1901805), and Major Science and Technology Projects in Yunnan Province (202102AB080016, 202103AA080004, 202202AB080010).

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	Articles by authors
	LI Cheng
	LI Shaoyuan
	MA Wenhui
	CHEN Xiuhua
	LIU Jiasen
	WANG Qidi
	TAO Jiyao

Cite this article:

LI Cheng,LI Shaoyuan,MA Wenhui, et al. Research Progress on Interface Optimization of Graphene/Silicon Schottky Junction[J]. Materials Reports, 2022, 36(21): 20080040-8.

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http://www.mater-rep.com/EN/10.11896/cldb.20080040 OR http://www.mater-rep.com/EN/Y2022/V36/I21/20080040

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