Guo Ruiqi, Huang Fei, Zheng Kaibo, Pullerits Tönu, Tian Jianjun
Institute for Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China.
Department of Chemical Physics and NanoLund , Lund University , Box 124, 22100 Lund , Sweden.
ACS Appl Mater Interfaces. 2018 Oct 17;10(41):35656-35663. doi: 10.1021/acsami.8b13777. Epub 2018 Oct 8.
A novel hybrid hole transport layer (HTL) of CuInSe quantum dots (QDs)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) was developed to enhance the performance of halide metal perovskite (MAPbI)-based photodetectors. The introduction of CuInSe QDs not only improved the wettability of the PEDOT:PSS HTL for the growth of perovskite crystals but also facilitated the transportation of holes from the perovskite to the HTL. As a result, both responsivity and detectivity of the device were increased dramatically by CuInSe QDs hybrid HTL, showing excellent photoresponsivity of 240 mA/W, larger ratio of photocurrent density to dark current density of 4.1 × 10, fast on-off switching properties of <0.02 s, and remarkable detectivity values of 1.02 × 10 Jones at 580 nm and above 5.01 × 10 Jones over the visible light region without an external bias voltage. In addition, the photodetectors also showed excellent thermal stability in the range of 10-110 °C. Therefore, a unique design idea of a hole transport material would be an anticipated direction for efficient halide metal perovskite-based devices.
为了提高基于卤化物金属钙钛矿（MAPbI）的光电探测器的性能，开发了一种新型的铜铟硒量子点（QDs）/聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）混合空穴传输层（HTL）。铜铟硒量子点的引入不仅改善了PEDOT:PSS空穴传输层对钙钛矿晶体生长的润湿性，还促进了空穴从钙钛矿向空穴传输层的传输。结果，通过铜铟硒量子点混合空穴传输层，器件的响应度和探测率都显著提高，在无外部偏置电压的情况下，在580nm处表现出240mA/W的优异光响应度、4.1×10的光电流密度与暗电流密度的较大比值、<0.02s的快速开关特性以及1.02×10琼斯的显著探测率值，在可见光区域探测率值高于5.01×10琼斯。此外，光电探测器在10-110°C范围内还表现出优异的热稳定性。因此，空穴传输材料的独特设计理念将是高效卤化物金属钙钛矿基器件的一个预期发展方向。
