All-inorganic CsPbBr3 perovskite solar cells with enhanced efficiency by exploiting lone pair electrons via passivation of crystal boundary using carbon nitride (g-C3N4) nanosheets

doi:10.1016/j.mtener.2021.100782

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	All-inorganic CsPbBr3 perovskite solar cells with enhanced efficiency by exploiting lone pair electrons via passivation of crystal boundary using carbon nitride (g-C3N4) nanosheets
	Liu, W. -W.2,3; Liu, Y. -C.2,3; Cui, C. -Y.2,3; Niu, S. -T.2,3; Niu, W. -J.2,3; Liu, M. -C.2,3; Liu, M. -J.1,4,5; Gu, B.1,4,5; Zhang, L. -y.2,3; Zhao, K.2,3
刊名	MATERIALS TODAY ENERGY
	2021-09
卷号	21
关键词	CsPbBr3 PSCs G-C3N4 additives Optimize film quality Coupling effect Energy barrier
ISSN号	2468-6069
DOI	10.1016/j.mtener.2021.100782
英文摘要	Fast extraction of photo-generated charge plays a crucial function in improving the photovoltaic conversion efficiency (PCE) of the perovskite solar cells (PSCs). Here, an effective strategy to decrease the charge recombination losses by introducing versatile carbon nitride (g-C3N4) nanosheets to the CsPbBr3 films was demonstrated. The incorporation of the g-C3N4 additive can restrain the nucleation and crystalline growth rate of perovskite films by an interaction of lone pair electrons from the exposed N atoms to the PbBr2 precursor, resulting in high-quality CsPbBr3 films with an increase in crystalline size. Notably, a 'coupling effect' between the lone pair electrons from g-C3N4 nanosheets and unsaturated Pb dangling bonds (Br vacancies) around the grain boundaries significantly decreases trap states caused by defects, leading to the fewer recombination centers in CsPbBr3 films. The g-C3N4 nanosheets serving as an energy barrier can also successfully suppress the recombination loss of back electrons with holes from the g-C3N4 interface, yielding a superior PCE of 8.0% with a fill factor of 80.25%. The result opens an alternative path to enhance the performance of CsPbBr3 PSCs by passivating the trap states of perovskite films with the improvement of the crystallization quality and charge extraction efficiency. (C) 2021 Published by Elsevier Ltd.
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000701824000007
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148987]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 80424, Taiwan 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 3.Lanzhou Univ Technol, Coll Mat Sci & Engn, Lanzhou 730050, Peoples R China; 4.Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan; 5.Natl Tsing Hua Univ, Frontier Res Ctr Fundamental & Appl Sci Matters, Hsinchu 30013, Taiwan;
推荐引用方式 GB/T 7714	Liu, W. -W.,Liu, Y. -C.,Cui, C. -Y.,et al. All-inorganic CsPbBr3 perovskite solar cells with enhanced efficiency by exploiting lone pair electrons via passivation of crystal boundary using carbon nitride (g-C3N4) nanosheets[J]. MATERIALS TODAY ENERGY,2021,21.
APA	Liu, W. -W..,Liu, Y. -C..,Cui, C. -Y..,Niu, S. -T..,Niu, W. -J..,...&Chueh, Y. -L..(2021).All-inorganic CsPbBr3 perovskite solar cells with enhanced efficiency by exploiting lone pair electrons via passivation of crystal boundary using carbon nitride (g-C3N4) nanosheets.MATERIALS TODAY ENERGY,21.
MLA	Liu, W. -W.,et al."All-inorganic CsPbBr3 perovskite solar cells with enhanced efficiency by exploiting lone pair electrons via passivation of crystal boundary using carbon nitride (g-C3N4) nanosheets".MATERIALS TODAY ENERGY 21(2021).