Guo Linjuan, Yang Xiaoran, Liang Yu, Wu Zihao, San Xingyuan, Wang Zhenguang, Li Leipeng, Liu Zhenyang, Chen Jianhui, Wang Shufang, Zhang Xuning, Pan Caofeng, Yang Zheng
Hebei Key Laboratory of Photo-Electricity Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China.
Key Laboratory of Chemical Biology of Hebei Province, Key Laboratory of Medicinal Chemistry and Molecular Diagnosis, Ministry of Education, College of Chemistry and Materials Science, Hebei University, Baoding 071002, P. R. China.
Nano Lett. 2024 Sep 18;24(37):11599-11606. doi: 10.1021/acs.nanolett.4c03143. Epub 2024 Sep 4.
2D layered metal halide perovskites (MHPs) are a potential material for fabricating self-powered photodetectors (PDs). Nevertheless, 2D MHPs produced via solution techniques frequently exhibit multiple quantum wells, leading to notable degradation in the device performance. Besides, the wide band gap in 2D perovskites limits their potential for broad-band photodetection. Integrating narrow-band gap materials with perovskite matrices is a viable strategy for broad-band PDs. In this study, the use of methylamine acetate (MAAc) as an additive in 2D perovskite precursors can effectively control the width of the quantum wells (QWs). The amount of MAAc greatly affects the phase purity. Subsequently, PbSe QDs were embedded into the 2D perovskite matrix with a broadened absorption spectrum and no negative effects on ferroelectric properties. PM6:Y6 was combined with the hybrid ferroelectric perovskite films to create a self-powered and broad-band PD with enhanced performance due to a ferro-pyro-phototronic effect, reaching a peak responsivity of 2.4 A W at 940 nm.
二维层状金属卤化物钙钛矿（MHP）是制造自供电光电探测器（PD）的潜在材料。然而，通过溶液技术制备的二维MHP经常表现出多个量子阱，导致器件性能显著下降。此外，二维钙钛矿中的宽带隙限制了它们在宽带光检测方面的潜力。将窄带隙材料与钙钛矿基质集成是实现宽带PD的可行策略。在本研究中，在二维钙钛矿前驱体中使用醋酸甲胺（MAAc）作为添加剂可以有效控制量子阱（QW）的宽度。MAAc的用量对相纯度有很大影响。随后，将PbSe量子点嵌入二维钙钛矿基质中，拓宽了吸收光谱，且对铁电性能没有负面影响。将PM6:Y6与混合铁电钙钛矿薄膜相结合，由于铁热光电效应，制造出了一种性能增强的自供电宽带PD，在940 nm处达到了2.4 A/W的峰值响应率。
