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Inorganic perovskite/organic tandem solar cells with 25.1% certified efficiency via bottom contact modulation

Author

Listed:
  • Yu Han

    (The Hong Kong Polytechnic University)

  • Jiehao Fu

    (The Hong Kong Polytechnic University)

  • Zhiwei Ren

    (The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University)

  • Jiangsheng Yu

    (The Hong Kong Polytechnic University)

  • Qiong Liang

    (The Hong Kong Polytechnic University)

  • Zhihang Xu

    (The Hong Kong Polytechnic University)

  • Xiyun Xie

    (The Hong Kong Polytechnic University)

  • Dongyang Li

    (The Hong Kong Polytechnic University)

  • Ruijie Ma

    (The Hong Kong Polytechnic University)

  • Menghua Cao

    (The Hong Kong Polytechnic University)

  • Yonggui Sun

    (Shenzhen Polytechnic)

  • Chen Yang

    (The Hong Kong Polytechnic University)

  • Jiaqi He

    (The Hong Kong Polytechnic University)

  • Xiaoming Chang

    (King Abdullah University of Science and Technology (KAUST))

  • Kuan Liu

    (The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University)

  • Patrick W. K. Fong

    (The Hong Kong Polytechnic University)

  • Jiaming Huang

    (The Hong Kong Polytechnic University)

  • Heng Liu

    (The Chinese University of Hong Kong)

  • Zhike Liu

    (Shaanxi Normal University)

  • Dongfang Xu

    (Shaanxi Normal University)

  • Lei Cheng

    (The Hong Kong Polytechnic University)

  • Jiyao Zhang

    (The Hong Kong Polytechnic University)

  • Guang Yang

    (The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University)

  • Xinhui Lu

    (The Chinese University of Hong Kong)

  • Ye Zhu

    (The Hong Kong Polytechnic University)

  • Qidong Tai

    (Wuhan University)

  • Qianqian Lin

    (Wuhan University)

  • Hanlin Hu

    (Shenzhen Polytechnic)

  • Yang Yang

    (University of California Los Angeles (UCLA))

  • Gang Li

    (The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University
    The Hong Kong Polytechnic University)

Abstract

Wide-bandgap perovskites in monolithic perovskite/organic tandem solar cells face challenges such as unregulated crystallization, severe defect traps, poor energetic alignment and undesirable phase transitions, primarily due to unfavourable bottom interfacial contact. These issues lead to energy loss and device degradation. In this Article, we synthesize acidic magnesium-doped tin oxide quantum dots to modulate the bottom interface contact in wide-bandgap CsPbI2Br perovskite solar cells. This design balances physical, chemical, structural and energetic properties, passivating defects, optimizing energy band alignment, enhancing perovskite film growth and mitigating instability. We also elucidate the instability mechanism caused by alkaline-based tin oxide bottom contact, emphasizing the impact of the tin oxide solution’s acid/base properties on the stability and performance of the device. Consequently, the wide-bandgap CsPbI2Br solar cell achieves a power conversion efficiency of 19.2% with a 1.44 V open-circuit voltage. The perovskite/organic tandem solar cell demonstrates an efficiency of 25.9% (certified at 25.1%), with improved stability under various conditions.

Suggested Citation

  • Yu Han & Jiehao Fu & Zhiwei Ren & Jiangsheng Yu & Qiong Liang & Zhihang Xu & Xiyun Xie & Dongyang Li & Ruijie Ma & Menghua Cao & Yonggui Sun & Chen Yang & Jiaqi He & Xiaoming Chang & Kuan Liu & Patric, 2025. "Inorganic perovskite/organic tandem solar cells with 25.1% certified efficiency via bottom contact modulation," Nature Energy, Nature, vol. 10(4), pages 513-525, April.
    • Handle: RePEc:nat:natene:v:10:y:2025:i:4:d:10.1038_s41560-025-01742-8
    DOI: 10.1038/s41560-025-01742-8
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