Defect engineering in wide-bandgap perovskites for efficient perovskite–silicon tandem solar cells

Guang Yang; Zhenyi Ni; Zhengshan J. Yu; Bryon W. Larson; Zhenhua Yu; Bo Chen; Abdulwahab Alasfour; Xun Xiao; Joseph M. Luther; Zachary C. Holman; Jinsong Huang

doi:10.1038/s41566-022-01033-8

Defect engineering in wide-bandgap perovskites for efficient perovskite–silicon tandem solar cells

Guang Yang, Zhenyi Ni, Zhengshan J. Yu, Bryon W. Larson, Zhenhua Yu, Bo Chen, Abdulwahab Alasfour, Xun Xiao, Joseph M. Luther, Zachary C. Holman, Jinsong Huang

Research output: Contribution to journal › Article › peer-review

108 Scopus citations

Abstract

Wide-bandgap (WBG) mixed-halide perovskites show promise of realizing efficient tandem solar cells but at present suffer from large open-circuit voltage loss and the mechanism is still unclear. Here we show that WBG perovskites with iodide–bromide compositions have an increased concentration of deep traps induced by iodide interstitials, which limits performance of WBG perovskite cells. We employ tribromide ions to suppress the iodide interstitial formation and thus reduce charge recombination in bladed WBG perovskite films of Cs_0.1FA_0.2MA_0.7Pb(I_0.85Br_0.15)₃. The 1-µm-thick opaque WBG perovskite solar cells have an efficiency of 21.9%, a small open-circuit voltage deficit of 0.40 V and a large fill factor of 83%. The efficiency of the best-performing monolithic perovskite–silicon tandem cell using this perovskite reaches 28.6%. The tribromide addition also suppresses light-induced phase segregation in WBG perovskites and thus enhance device stability. Encapsulated tandem cells maintain 93% of their initial efficiency after operation for 550 h.

Original language	English (US)
Pages (from-to)	588-594
Number of pages	7
Journal	Nature Photonics
Volume	16
Issue number	8
DOIs	https://doi.org/10.1038/s41566-022-01033-8
State	Published - Aug 2022

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

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title = "Defect engineering in wide-bandgap perovskites for efficient perovskite–silicon tandem solar cells",

abstract = "Wide-bandgap (WBG) mixed-halide perovskites show promise of realizing efficient tandem solar cells but at present suffer from large open-circuit voltage loss and the mechanism is still unclear. Here we show that WBG perovskites with iodide–bromide compositions have an increased concentration of deep traps induced by iodide interstitials, which limits performance of WBG perovskite cells. We employ tribromide ions to suppress the iodide interstitial formation and thus reduce charge recombination in bladed WBG perovskite films of Cs0.1FA0.2MA0.7Pb(I0.85Br0.15)3. The 1-µm-thick opaque WBG perovskite solar cells have an efficiency of 21.9%, a small open-circuit voltage deficit of 0.40 V and a large fill factor of 83%. The efficiency of the best-performing monolithic perovskite–silicon tandem cell using this perovskite reaches 28.6%. The tribromide addition also suppresses light-induced phase segregation in WBG perovskites and thus enhance device stability. Encapsulated tandem cells maintain 93% of their initial efficiency after operation for 550 h.",

author = "Guang Yang and Zhenyi Ni and Yu, {Zhengshan J.} and Larson, {Bryon W.} and Zhenhua Yu and Bo Chen and Abdulwahab Alasfour and Xun Xiao and Luther, {Joseph M.} and Holman, {Zachary C.} and Jinsong Huang",

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year = "2022",

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AU - Yang, Guang

AU - Ni, Zhenyi

AU - Yu, Zhengshan J.

AU - Larson, Bryon W.

AU - Yu, Zhenhua

AU - Chen, Bo

AU - Alasfour, Abdulwahab

AU - Xiao, Xun

AU - Luther, Joseph M.

AU - Holman, Zachary C.

AU - Huang, Jinsong

PY - 2022/8

Y1 - 2022/8

N2 - Wide-bandgap (WBG) mixed-halide perovskites show promise of realizing efficient tandem solar cells but at present suffer from large open-circuit voltage loss and the mechanism is still unclear. Here we show that WBG perovskites with iodide–bromide compositions have an increased concentration of deep traps induced by iodide interstitials, which limits performance of WBG perovskite cells. We employ tribromide ions to suppress the iodide interstitial formation and thus reduce charge recombination in bladed WBG perovskite films of Cs0.1FA0.2MA0.7Pb(I0.85Br0.15)3. The 1-µm-thick opaque WBG perovskite solar cells have an efficiency of 21.9%, a small open-circuit voltage deficit of 0.40 V and a large fill factor of 83%. The efficiency of the best-performing monolithic perovskite–silicon tandem cell using this perovskite reaches 28.6%. The tribromide addition also suppresses light-induced phase segregation in WBG perovskites and thus enhance device stability. Encapsulated tandem cells maintain 93% of their initial efficiency after operation for 550 h.

AB - Wide-bandgap (WBG) mixed-halide perovskites show promise of realizing efficient tandem solar cells but at present suffer from large open-circuit voltage loss and the mechanism is still unclear. Here we show that WBG perovskites with iodide–bromide compositions have an increased concentration of deep traps induced by iodide interstitials, which limits performance of WBG perovskite cells. We employ tribromide ions to suppress the iodide interstitial formation and thus reduce charge recombination in bladed WBG perovskite films of Cs0.1FA0.2MA0.7Pb(I0.85Br0.15)3. The 1-µm-thick opaque WBG perovskite solar cells have an efficiency of 21.9%, a small open-circuit voltage deficit of 0.40 V and a large fill factor of 83%. The efficiency of the best-performing monolithic perovskite–silicon tandem cell using this perovskite reaches 28.6%. The tribromide addition also suppresses light-induced phase segregation in WBG perovskites and thus enhance device stability. Encapsulated tandem cells maintain 93% of their initial efficiency after operation for 550 h.

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Defect engineering in wide-bandgap perovskites for efficient perovskite–silicon tandem solar cells

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