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Improving carrier separation at the TiO2/CsPbIBr2 interface by gradient Sn-doping.

Yingfeng Li1, Bingxin Wang1, Yingjian Liu1

  • 1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, 102206, China. mcli@ncepu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|November 18, 2022
PubMed
Summary
This summary is machine-generated.

Gradient tin (Sn) doping in cesium lead bromoiodide (CsPbIBr2) solar cells enhances charge separation at the TiO2 interface. This method improves efficiency by optimizing the bandgap and electric field, offering a cost-effective alternative to samarium doping.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Renewable Energy

Background:

  • Samarium (Sm)-doping in CsPbIBr2 solar cells improved efficiency by reducing the bandgap, but Sm is costly.
  • Tin (Sn) is an abundant, cheaper alternative that can tune the CsPbIBr2 bandgap over a wider range.
  • Investigating Sn-doping's impact on carrier dynamics at the TiO2/CsPbIBr2 interface is crucial for efficient solar cell design.

Purpose of the Study:

  • To investigate the effects of gradient Sn-doping in CsPbIBr2 on carrier separation at the TiO2/CsPbIBr2 interface.
  • To analyze the influence of Sn-doping on the cross-interface electric field, bandgap, and band matching.
  • To establish a TiO2/CsPbIBr2 interface model using first-principles calculations.

Main Methods:

  • First-principles calculations were employed to model the TiO2/CsPbIBr2 interface with gradient Sn-doping.
  • Analysis focused on the cross-interface electric field, bandgap variations, and band alignment.
  • Carrier separation behaviors were studied under different Sn-doping concentrations and distributions.

Main Results:

  • Gradient Sn-doping enhances electron transfer from TiO2 to CsPbIBr2, strengthening the interface electric field.
  • The bandgap of CsPbIBr2 layers increases away from the interface, with Sn-doping creating more uniform bandgap steps.
  • These modifications significantly improve carrier separation efficiency at the TiO2/CsPbIBr2 interface.

Conclusions:

  • Gradient Sn-doping is an effective strategy to enhance carrier separation at the TiO2/CsPbIBr2 interface.
  • This approach offers a promising, cost-effective route to improve the performance of CsPbIBr2-based solar cells.
  • The findings provide valuable insights for designing advanced perovskite solar cell architectures.