Perovskite films with gradient bandgap for self-powered multiband photodetectors and spectrometers  

作　　者：Chuantian Zuo Lixiu Zhang Xiyan Pan He Tian Keyou Yan Yuanhang Cheng Zhiwen Jin Chenyi Yi Xiaoliang Zhang Wu-Qiang Wu Qinye Bao Liyuan Han Liming Ding 

机构地区：[1]Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China [2]School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China [3]School of Integrated Circuits,Tsinghua University,Beijing 100084,China [4]School of Environment and Energy,South China University of Technology,Guangzhou 510000,China [5]School of New Energy,Nanjing University of Science and Technology,Jiangyin 214443,China [6]School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China [7]State Key Laboratory of Power System,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China [8]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [9]School of Chemistry,Sun Yat-sen University,Guangzhou 510006,China [10]State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China [11]Key Laboratory of Semiconductor Materials Science,Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China

出　　处：《Nano Research》2023年第7期10256-10262,共7页纳米研究（英文版）

基　　金：We thank the National Natural Science Foundation of China(Nos.52203217 and 21961160720);the National Key Research and Development Program of China(No.2022YFB3803300);the Open Research Fund of Songshan Lake Materials Laboratory(No.2021SLABFK02)for financial support.

摘　　要：Bandgap-graded materials present varying spectral responses at different positions,making them possible to be used as an alternative to photoactive materials array in multi-spectral responsive devices,thus miniaturizing the apparatus.However,the preparation of bandgap-graded materials usually requires complicated deposition process.Here we report a facile lowtemperature solution process to make films with lateral bandgap gradients,which form spontaneously via self-spreading and interdiffusion of solutions.We show lead halide perovskite films with MAPbCl_(3)-MAPbBr_(3)and MAPbBr_(3)-MAPbI_(3)gradients,which exhibit light absorption onsets ranging from 410 to 781 nm.The bandgap-graded films were used to make self-powered multiband photodetectors,which show different spectral responses at different positions without applying bias voltage.Furthermore,self-powered spectrometers were made by using the multiband photodetectors.

关 键 词：self-spreading INTERDIFFUSION bandgap-graded perovskite multiband photodetectors self-powered spectrometers 

分 类 号：TB383[一般工业技术—材料科学与工程]