Kim Yu Hyun, Jung Jae Woong
Department of Advanced Materials Engineering for Information & Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si 446-701, Gyeonggi-do, Republic of Korea.
Integrated Education Institute for Frontier Science & Technology (BK21 Four), Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si 446-701, Gyeonggi-do, Republic of Korea.
Molecules. 2025 May 17;30(10):2195. doi: 10.3390/molecules30102195.
This study aims to enhance optoelectronic properties of all-inorganic perovskite photodetectors (PDs) by incorporating a bilayer electron transport layer (ETL). The bilayer ETL composed of SnO and ZnO effectively optimizes energy level alignment at the interface, facilitating efficient electron extraction from the CsPbIBr perovskite layer while suppressing shunt pathways. Additionally, it enhances interfacial properties by mitigating defects and minimizing dark current leakage, thereby improving overall device performance. As a result, the bilayer ETL-based PDs exhibit broadband photoresponsivity in 300 to 700 nm with a responsivity of 0.45 A W and a specific detectivity of 9 × 10 Jones, outperforming the single-ETL devices. Additionally, they demonstrate stable cyclic photoresponsivity with fast response times (14 μs for turn-on and 32 μs for turn-off). The bilayer ETL also improves long-term reliability and thermal stability, highlighting its potential for high performance, reliability, and practical applications of all-inorganic perovskite PDs.
本研究旨在通过引入双层电子传输层（ETL）来提高全无机钙钛矿光电探测器（PD）的光电性能。由SnO和ZnO组成的双层ETL有效地优化了界面处的能级排列，有助于从CsPbIBr钙钛矿层中高效提取电子，同时抑制分流路径。此外，它通过减少缺陷和最小化暗电流泄漏来增强界面性能，从而提高整体器件性能。结果，基于双层ETL的PD在300至700nm范围内表现出宽带光响应，响应度为0.45 A/W，比探测率为9×10 Jones，优于单ETL器件。此外，它们还展示了具有快速响应时间（开启为14μs，关闭为32μs）的稳定循环光响应。双层ETL还提高了长期可靠性和热稳定性，突出了其在全无机钙钛矿PD的高性能、可靠性和实际应用方面的潜力。
