Abnormal absorption onset shift of CH3NH3PbI3 film by adding PbBr2 into its precursor and its effect on photovoltaic performance

Qingbo Wei, Zhou Yang, Dong Yang, Feng Fu, Shengzhong (Frank) Liu

Research output: Contribution to journalArticle

Abstract

High quality CH3NH3PbI(3-x)Brx perovskite film with full surface coverage and fewer trap states was prepared using a single-step deposition process and PbBr2 doped perovskite precursor solution. Specifically, the thin film surface becomes rougher and the grain size gets larger as the PbBr2 concentration was increased from 1% to 10 mol%. Ultraviolet–visible spectroscopy (UV–vis) and incident photon-to-current efficiency (IPCE) spectra show that abnormal absorption onset shifts to longer wavelength with increasing the content of PbBr2, because the larger grain size can reduce the stress accumulated in the lattice over the Pb–I bond angle. It is surprising to see that when 5 mol% of PbBr2 was used, the CH3NH3PbI3 (MAPbI3) shows the best thermal stability, with the decomposition onset increased by about 20 °C. The photoluminescence (PL) peak of the CH3NH3PbI(3-x)Brx film shifts to smaller wavelength as more PbBr2 was used owing to decreased trap states in perovskite films. It is found that at the optimal PbBr2 content of 5 mol%, the CH3NH3PbI(3-x)Brx based solar cell gives open-circuit voltage of 1.08 V with power conversion efficiency (PCE) as high as 18.97%, about 16.6% higher than the device based on the MAPbI3 without Br.

Original languageEnglish (US)
Article number226914
JournalJournal of Power Sources
Volume437
DOIs
StatePublished - Oct 15 2019

Fingerprint

Perovskite
shift
grain size
traps
Wavelength
Open circuit voltage
open circuit voltage
wavelengths
Conversion efficiency
Solar cells
Photoluminescence
Thermodynamic stability
thermal stability
Photons
solar cells
Spectroscopy
Decomposition
photoluminescence
decomposition
Thin films

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

@article{99f1f93c1bbf43f3a5b3751462065f6c,
title = "Abnormal absorption onset shift of CH3NH3PbI3 film by adding PbBr2 into its precursor and its effect on photovoltaic performance",
abstract = "High quality CH3NH3PbI(3-x)Brx perovskite film with full surface coverage and fewer trap states was prepared using a single-step deposition process and PbBr2 doped perovskite precursor solution. Specifically, the thin film surface becomes rougher and the grain size gets larger as the PbBr2 concentration was increased from 1{\%} to 10 mol{\%}. Ultraviolet–visible spectroscopy (UV–vis) and incident photon-to-current efficiency (IPCE) spectra show that abnormal absorption onset shifts to longer wavelength with increasing the content of PbBr2, because the larger grain size can reduce the stress accumulated in the lattice over the Pb–I bond angle. It is surprising to see that when 5 mol{\%} of PbBr2 was used, the CH3NH3PbI3 (MAPbI3) shows the best thermal stability, with the decomposition onset increased by about 20 °C. The photoluminescence (PL) peak of the CH3NH3PbI(3-x)Brx film shifts to smaller wavelength as more PbBr2 was used owing to decreased trap states in perovskite films. It is found that at the optimal PbBr2 content of 5 mol{\%}, the CH3NH3PbI(3-x)Brx based solar cell gives open-circuit voltage of 1.08 V with power conversion efficiency (PCE) as high as 18.97{\%}, about 16.6{\%} higher than the device based on the MAPbI3 without Br.",
author = "Qingbo Wei and Zhou Yang and Dong Yang and Feng Fu and Liu, {Shengzhong (Frank)}",
year = "2019",
month = "10",
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language = "English (US)",
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journal = "Journal of Power Sources",
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Abnormal absorption onset shift of CH3NH3PbI3 film by adding PbBr2 into its precursor and its effect on photovoltaic performance. / Wei, Qingbo; Yang, Zhou; Yang, Dong; Fu, Feng; Liu, Shengzhong (Frank).

In: Journal of Power Sources, Vol. 437, 226914, 15.10.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Abnormal absorption onset shift of CH3NH3PbI3 film by adding PbBr2 into its precursor and its effect on photovoltaic performance

AU - Wei, Qingbo

AU - Yang, Zhou

AU - Yang, Dong

AU - Fu, Feng

AU - Liu, Shengzhong (Frank)

PY - 2019/10/15

Y1 - 2019/10/15

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AB - High quality CH3NH3PbI(3-x)Brx perovskite film with full surface coverage and fewer trap states was prepared using a single-step deposition process and PbBr2 doped perovskite precursor solution. Specifically, the thin film surface becomes rougher and the grain size gets larger as the PbBr2 concentration was increased from 1% to 10 mol%. Ultraviolet–visible spectroscopy (UV–vis) and incident photon-to-current efficiency (IPCE) spectra show that abnormal absorption onset shifts to longer wavelength with increasing the content of PbBr2, because the larger grain size can reduce the stress accumulated in the lattice over the Pb–I bond angle. It is surprising to see that when 5 mol% of PbBr2 was used, the CH3NH3PbI3 (MAPbI3) shows the best thermal stability, with the decomposition onset increased by about 20 °C. The photoluminescence (PL) peak of the CH3NH3PbI(3-x)Brx film shifts to smaller wavelength as more PbBr2 was used owing to decreased trap states in perovskite films. It is found that at the optimal PbBr2 content of 5 mol%, the CH3NH3PbI(3-x)Brx based solar cell gives open-circuit voltage of 1.08 V with power conversion efficiency (PCE) as high as 18.97%, about 16.6% higher than the device based on the MAPbI3 without Br.

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