2024年9月30日，Elsevier 旗下top期刊《Journal of Colloid and Interface Science》（影响因子：9.4）在线发表了云南师范大学物理与电子信息学院谭秋红副教授和王前进教授最新研究成果《Ultrahigh-performance photodetectors based on low-dimensional Cs₂AgBiBr₆/CdS heterojunction》。云南师范大学物理与电子信息学院谭秋红副教授和王前进教授为共同通讯作者。

Abstract

Lead-free double perovskite Cs₂AgBiBr₆ has garnered increasing attention in photoelectric applications owing to its good stability and excellent photoelectric properties. However, the poor carrier transport in Cs₂AgBiBr₆ thin films constraints their further application in photodetection. To overcome this issue, we have developed an innovative low-dimensional Cs₂AgBiBr₆/CdS heterojunction photodetector with substantially improved performance. The device achieved a high responsivity of 6.66 × 10³ A/W, an outstanding specific detectivity of 2.10 × 10¹⁴ Jones, and an impressive external quantum efficiency of 1.88 × 10⁶ %. Additionally, the on/off current ratio of the heterojunction device reached an impressive 6.18 × 10⁷. These key parameters are significantly better than those of most previously reported Cs₂AgBiBr₆-based photodetectors. Furthermore, scanning photocurrent mapping and band arrangement analysis were performed to elucidate the mechanism of photocurrent generation and transport in the low-dimensional Cs₂AgBiBr₆/CdS heterojunction photodetectors. This study highlights the outstanding performance of Cs₂AgBiBr₆/CdS heterojunction and provides a simple and effective strategy for developing high-performance Cs₂AgBiBr₆-based photodetectors.

扩展阅读：王前进-云南师范大学物理与电子信息学院谭秋红-云南师范大学物理与电子信息学院

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