Lim Sung Yeon, Choi Yeo Jin, Park So Jeong, Hong Geon Pyo, Kim Jin Young
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul 08826, Republic of Korea.
ACS Appl Mater Interfaces. 2025 Apr 23;17(16):23885-23891. doi: 10.1021/acsami.4c22601. Epub 2025 Apr 11.
Although perovskite-based triple-junction tandem solar cells have a higher theoretical maximum efficiency than the double-junction counterparts, their actual performances are not only far behind the theoretical one but also worse than the double-junction cells. One of the major issues limiting their performances is that the overall tandem current density is limited by the middle cell with a bandgap energy higher than the optimum value. In this study, we propose a comprehensive design rule of the middle cell specifically optimized for triple-tandem applications. We investigated the thickness effect of medium-bandgap perovskite and electron-transporting layers, especially focusing on the spectral responses to the filtered incident light in order to maximize the middle-cell photocurrent density and thus the overall tandem current density. This triple-tandem-specific designing of the middle cell leads to a high current density of 11 mA/cm for the perovskite/perovskite/Si 3J tandem solar cell, and its conversion efficiency could be further increased to as high as 24.96% after additional interfacial defect passivation by PDAI.
尽管基于钙钛矿的三结串联太阳能电池比双结太阳能电池具有更高的理论最大效率，但其实际性能不仅远低于理论值，而且比双结电池更差。限制其性能的主要问题之一是，整个串联电流密度受到带隙能量高于最佳值的中间电池的限制。在本研究中，我们提出了一种专门为三结串联应用优化的中间电池综合设计规则。我们研究了中带隙钙钛矿和电子传输层的厚度效应，特别关注对滤波入射光的光谱响应，以最大化中间电池的光电流密度，从而最大化整个串联电流密度。这种针对三结串联的中间电池设计使得钙钛矿/钙钛矿/硅三结串联太阳能电池的电流密度高达11 mA/cm²，并且在通过PDAI进行额外的界面缺陷钝化后，其转换效率可进一步提高至24.96%。
