Key Laboratory of Luminescence and Optical Information;
Ministry of Education;
Beijing JiaoTong University;
Beijing 100044;
China;
School of Instrument Science and Opto-Electronics Engineering;
Beijing Information Science and Technology University;
Beijing 100192;
China;
School of Materials Science and Engineering;
University of Science and Technology Beijing;
Beijing 100083;
China;
Interface engineering; Perovskite solar cell; Two-dimensional perovskite; Hole extraction layer; Band alignment;