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DOI	10.1039/c9ee04203b
	Device physics of back-contact perovskite solar cells
	Yang Z.; Yang Z.; Yang W.; Yang X.; Greer J.C.; Sheng J.; Yan B.; Ye J.
发表日期	2020
ISSN	1754-5692
起始页码	1753
结束页码	1765
卷号	13 期号:6
英文摘要	Back-contact perovskite solar cells (PSCs) are a promising candidate to further increase power conversion efficiency (PCE) and have been the subject of many investigations. However their full potential has not been achieved due to a lack of a complete understanding of their operation from a device physics perspective. In this study, a detailed photoelectrical model for back-contact PSCs is developed by coupling a drift-diffusion description of a free charge transport model with ion migration currents and emitted-carrier generation resulting from photon recycling. By studying the influence of relevant electrical parameters, the interplay between charge generation, transport and recombination is revealed to further clarify the design principles based on devices with a back-contact structure. Although devices featuring the back-contact structure exhibit sensitivity to electrical parameters, a high PCE exceeding 25% is predicted if the interface passivation and perovskite film quality can be well controlled. Different conduction band and valence band offsets offering various screening opportunities for functional materials with high efficiencies are introduced. Additionally, the simulated results revealed that mobile ions degrade the device performance if the average ion concentration exceeds 1016 cm-3. Furthermore, we point out that photon recycling can effectively compensate for radiative recombination, thereby resulting in an improved open circuit voltage. The results provide a new understanding of the carrier transport dynamics, ion migration, and photon recycling effects for the back-contact structure, which can be applied for a systematic improvement in the design of high efficiency PSCs. © The Royal Society of Chemistry.
语种	英语
scopus关键词	Carrier transport; Efficiency; Electric network parameters; Functional materials; Ions; Open circuit voltage; Perovskite; Photons; Recycling; Solar power generation; Structural design; Carrier generation; Carrier transport dynamics; Electrical parameter; Interface passivation; Ion concentrations; Power conversion efficiencies; Radiative recombination; Valence band offsets; Perovskite solar cells
来源期刊	Energy and Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162884
作者单位	Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences (CAS), Ningbo, 315201, China; Department of Electrical and Electronic Engineering, Faculty of Science and Engineering, University of Nottingham, Ningbo, 315100, China
推荐引用方式 GB/T 7714	Yang Z.,Yang Z.,Yang W.,et al. Device physics of back-contact perovskite solar cells[J],2020,13(6).
APA	Yang Z..,Yang Z..,Yang W..,Yang X..,Greer J.C..,...&Ye J..(2020).Device physics of back-contact perovskite solar cells.Energy and Environmental Science,13(6).
MLA	Yang Z.,et al."Device physics of back-contact perovskite solar cells".Energy and Environmental Science 13.6(2020).