Stable and Efficient Graded MA0.83Cs0.17Pb(I0.83Br0.17)3 Alloy Thin Film-Based Inverted-Type Perovskite Solar Cells

Sheng Hsiung Chang, Kai Ren Cheng, Anjali Chandel, Jia Ren Wu, Ji Lin Shen, Sheng Hui Chen

Research output: Contribution to journalArticlepeer-review


The surface morphologies, crystallinities, and excitonic characteristics of MAxCs1−xPb(IxBr1−x)3 thin films deposited on top of the P3CT-Na/ITO/glass substrates are investigated by using the atomic-force microscopic images, absorbance spectra, grazing incidence X-ray diffraction patterns, photoluminescence (PL) spectra, and Raman scattering spectra. The P3CT-Na-based perovskite solar cell shows a stable and efficient maximum power density curve due to the formation of a graded MA0.83Cs0.17Pb(I0.83Br0.17)3 alloy thin film which is confirmed by using the surface-sensitive PL and Raman scattering spectra. The highest power conversion efficiency (PCE) of the P3CT-Na-based MA0.83Cs0.17Pb(I0.83Br0.17)3 solar cells is 15.93% mainly due to the high fill factor of 79.4%. Besides, the PCE of the nonencapsulated solar cell slowly decreases to a moderate value (10.48%) within 157 days under an uncontrolled environment (55–60 relative humidity%) at room temperatures (22–25 °C).

Original languageEnglish
Article number2100607
JournalEnergy Technology
Issue number12
StatePublished - Dec 2021


  • P3CT-Na-based perovskite solar cells
  • graded MACsPb(IBr) alloy thin films
  • high fill factors
  • suppressed halide migration


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