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2022 Science: Beyond 24% Efficiency! How to Build an Interfacial Heterojunction for Inverse Perovskite Solar Cells?

Constructing heterojunctions by surface sulfidation for efficient inverted perovskite solar cells

Contents

Highlights

  • This study adopted the idea of constructing an interface heterojunction to increase the built-in potential and enhances the built-in potential of reverse perovskite cells.

  • Through surface sulfidation, an efficient interfacial heterojunction was constructed, and the reverse perovskite cell with an efficiency >24% was realized for the first time.
  • The perovskite solar cell showed excellent stability, the MPP output is 1000h under continuous illumination, and the efficiency decay is less than 10%.

Research motivation

Reverse perovskite cells have the advantages of simple process, low temperature preparation, and compatibility with crystalline silicon cells, and have greater development potential. However, the current high-efficiency perovskite cells all adopt the forward structure, and the efficiency of reverse perovskite cells has been low.

In this paper, for the reverse perovskite  solar cell, through the design of the interface heterojunction, the reverse perovskite  solar cell with an efficiency > 24% was realized for the first time. Moreover, PbS and perovskite had similar lattice parameters, and the Pb-S bond was much stronger than the Pb-I bond, which could stabilize the perovskite structure and  the interface, thereby improving the stability.

Instruments used in this article

Research results

 

After surface sulfidation, the reverse
perovskite cell efficiency was improved from the initial 21.8% to 24.3% with
almost no hysteresis.

The PbPyA2 and TMS concentrations required for the surface vulcanization process had an impact on the device efficiency, and the optimal conditions was PbPyA2 1mg/mL, TMS 3mg/mL.

2022 Science: Beyond 24% Efficiency! How to Build an Interfacial Heterojunction for Inverse Perovskite Solar Cells? Perovskite Solar Cell Photovoltaic performance
2022 Science: Beyond 24% Efficiency! How to Build an Interfacial Heterojunction for Inverse Perovskite Solar Cells? J V curves of PSCs with different SST layer thicknesses
2022 Science: Beyond 24% Efficiency! How to Build an Interfacial Heterojunction for Inverse Perovskite Solar Cells? Device Hysteresis in SST PSC

Keywords::constructing heterojunction, inverted perovskite solar cell, Solar Simulator, Sun Simulator

Article link:https://doi.org/10.1126/science.abl5676

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2022 Science Beyond 24% Efficiency! How to Build an Interfacial Heterojunction for Inverse Perovskite Solar Cells

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