文献类型：期刊文献

英文题名：Bilayer PbS Quantum Dots for High-Performance Photodetectors

作者：Ren, Zhenwei[1,2,3];Sun, Jiankun[3];Li, Hui[3];Mao, Peng[3];Wei, Yuanzhi[3];Zhong, Xinhua[1,2];Hu, Jinsong[3,4];Yang, Shiyong[3,4];Wang, Jizheng[3,4]

机构：[1]South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Guangdong, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Res Educ Ctr Excellence Mol Sci, Beijing 100190, Peoples R China;[4]Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China

年份：2017

卷号：29

期号：33

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20172603847857);WOS:【SCI-EXPANDED(收录号:WOS:000408933600026)】；

基金：This research was supported by the National Natural Science Foundation of China (No. 61405208), National Key Research Program of China (Grant No. 2016YFA0200104), 973 Program (Grant Nos. 2014CB643600 and 2014CB643503), and The Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB12030200). The authors declare no competing financial interests.

语种：英文

外文关键词：bilayers; junctions; PbS quantum dots; photodetectors; responsivities

摘要：Due to their wide tunable bandgaps, high absorption coefficients, easy solution processabilities, and high stabilities in air, lead sulfide (PbS) quantum dots (QDs) are increasingly regarded as promising material candidates for next-generation light, low-cost, and flexible photodetectors. Current single-layer PbS-QD photodetectors suffer from shortcomings of large dark currents, low on-off ratios, and slow light responses. Integration with metal nanoparticles, organics, and high-conducting graphene/nanotube to form hybrid PbS-QD devices are proved capable of enhancing photoresponsivity; but these approaches always bring in other problems that can severely hamper the improvement of the overall device performance. To overcome the hurdles current single-layer and hybrid PbS-QD photodetectors face, here a bilayer QD-only device is designed, which can be integrated on flexible polyimide substrate and significantly outperforms the conventional single-layer devices in response speed, detectivity, linear dynamic range, and signal-to-noise ratio, along with comparable responsivity. The results which are obtained here should be of great values in studying and designing advanced QD-based photodetectors for applications in future flexible optoelectronics.