Structural, optical and excitonic properties of MAxCs1-xPb(IxBr1-x)3 alloy thin films and their application in solar cells

Sheng Hsiung Chang, Pin Chia Tseng, Shou En Chiang, Jia Ren Wu, Yan Ta Chen, Ching Ju Chen, Chi Tsu Yuan, Sheng Hui Chen

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Abstract

The structural, optical and excitonic characteristics of MAxCs1-xPb(IxBr1-x)3 crystal thin films were investigated by using the X-ray diffraction patterns, scanning electron microscopic images, absorbance spectra and photoluminescence (PL) spectra. The time-dependent PL spectra shows that the MA0.8Cs0.2Pb(I0.8Br0.2)3 crystal thin film is a photo-stable light absorbing material, which results in an efficient and stable perovskite solar cell without the additional encapsulation. The highest power conversion efficiency (PCE) of MA0.8Cs0.2Pb(I0.8Br0.2)3 solar cells is 10.02%. In addition, the PCE decreases slowly toward a stable value (5.71%) for more than 120 days under moderate environment conditions (55–60 RH%).

Original languageEnglish
Article number110478
JournalSolar Energy Materials and Solar Cells
Volume210
DOIs
StatePublished - 15 Jun 2020

Keywords

  • MACsPb(IBr)
  • Stable perovskite solar cells
  • Time-dependent photoluminescence

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