Huaqiao University NC: Officially 26.39%! Ultrathin polymer films for improved hole extraction and ion blocking in PSCs

2025/8/30 8:45:09 admin 阅读 161【次】

A research team led by Wei Zhanhua and Xie Liqiang from Huaqiao University published a research paper titled "Ultrathin polymer membrane for improved hole extraction and ion blocking in perovskite solar cells" in Nature Communications. Shen Lina is the first author, and Wei Zhanhua and Xie Liqiang are co-corresponding authors.

Key Highlights: This paper reports that inserting an ultrathin (~7 nm) p-type polymer interlayer (D18) enables efficient hole transport but blocks ion diffusion between the perovskite and Spiro OMeTAD, thereby fabricating highly efficient and stable n-i-p PSCs. The PSCs achieved efficiencies of 26.39% (certified 26.17%) and 25.02% for pore areas of 0.12 and 1.00 cm², respectively. After 1100 hours of operation under maximum power point tracking, 95.4% of the initial efficiency was maintained, representing a significant improvement in the stability of high-efficiency n-i-p PSCs.

High-efficiency perovskite solar cells (PSCs) in a n-i-p structure suffer from a limited lifetime, primarily due to severe ion diffusion from the perovskite to the high-temperature layer (HTL), leading to irreversible degradation of the perovskite and failure of the HTL and electrodes, limiting the long-term stability of n-i-p PSCs. Therefore, designing internal barriers to prevent interlayer ion diffusion is crucial for improving the operating lifetime of n-i-p PSCs. However, the ion-blocking capability of the interlayer must be compatible with efficient hole extraction, a challenging trade-off.

To address this issue, the team led by Wei Zhanhua and Xie Liqiang from Huaqiao University introduced an ultrathin (~7 nm) p-type polymer interlayer (D18) with excellent ion-blocking capability between the perovskite and HTL, addressing these challenges. The ultrathin D18 interlayer effectively suppresses the interlayer diffusion of lithium, methylammonium, formamidine, and iodide ions. Furthermore, D18 improves energy level alignment at the perovskite/HTL interface, effectively reducing interfacial energy losses and enhancing hole extraction. The resulting PSCs achieved efficiencies of 26.39% (certified at 26.17%) and 25.02%, respectively, with pore areas of 0.12 and 1.00 cm². Remarkably, 95.4% of the initial efficiency was retained after 1100 hours of operation under maximum power point tracking, representing a significant improvement in the stability of high-efficiency n-i-p PSCs.

This study demonstrates that the introduction of a polymer D18 interlayer effectively blocks interlayer ion diffusion within PSCs while maintaining efficient hole transport, significantly improving the stability of n-i-p PSCs. The introduction of polymer charge-selective interlayers is a promising strategy to extend the lifetime of perovskite solar cells and solar modules, paving the way for commercial applications.

Source：https://doi.org/10.1038/s41467-024-55329-0

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Huaqiao University NC: Officially 26.39%! Ultrathin polymer films for improved hole extraction and ion blocking in PSCs

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