Title: Interface regulation of perovskite solar cells and exploration of nearby space applications
Reporter: Associate Professor Yongguang Tu, Northwestern Polytechnical University
Time: June 30, 2021 at 9:00 am
Location: Room 304, Block B, Physics Building
Organizers: Provincial Key Laboratory of Photovoltaic Materials, Topological Functional Materials Research Center
Abstract
In perovskite solar cells, the deep-level defects of the perovskite light-absorbing layer cause serious non-radiative recombination losses. Especially at the interface between the perovskite layer and the hole transport layer, the residual organic amine salt increases the proportion of non-radiative recombination, thereby limiting the performance improvement of the perovskite solar cell. Diboron compound (C12H10B2O4), as a common organic small molecule, can react with the residual formamidine iodide (H2NCHNH2I) on the surface of the perovskite to generate volatile matter. After heating, a "clean" perovskite film on the surface can be obtained. . Therefore, the use of diboron-assisted surface defect control strategy to remove the residual formamidine iodide on the surface of the perovskite and adjust the surface defect density can reduce non-radiative recombination and increase the extraction capacity of carriers between the perovskite and the hole transport layer , And finally obtained a photoelectric conversion efficiency of 21.11%. In addition, as the latest development of photovoltaic energy technology, perovskite solar cells have the advantages of flexible preparation, high energy-to-mass ratio, and high radiation resistance. They can provide energy supply for nearby space vehicles and will become a new generation of energy technology for space applications. By loading the perovskite solar cell on a high-altitude balloon, the stability of the device in the extreme environment of the adjacent space 35 km from the ground was studied. Finally, under the air quality AM0 irradiation, the stability data of the device maintaining its initial efficiency of more than 95% is obtained.
Introduction
Yongguang Tu, Associate Professor, Institute of Flexible Electronics, Northwestern Polytechnical University. Selected into the "2019 Postdoctoral International Exchange Program" Academic Exchange Program of China Postdoctoral Science Foundation, Peking University "Liberal Arts" Postdoctoral Program, presided over the 2021 National Natural Science Foundation Youth Project, 2020 Shaanxi Provincial Natural Science Foundation Youth Project, 62nd Approved the general project funding of the China Postdoctoral Science Foundation, and won the "Fujian Province Outstanding Doctoral Thesis" award. From 2008 to 2012, he studied at the College of Materials Science and Engineering, Huaqiao University (directly under the United Front Work Department), majoring in polymer materials and engineering; from 2012 to 2017, studying at the major of Materials Science, College of Materials Science and Engineering, Huaqiao University; from 2017 to 2019, Carried out post-doctoral research work in the School of Physics, Peking University; joined the Institute of Flexible Electronics of Northwestern Polytechnical University in June 2019. In recent years, he has published academic papers in important international academic journals such as Adv. Mater. (2), iScience, J. Mater. Chem. A (2), ACS Appl. Mater. Inter. (2), Nanoscale, Science, Nano Energy, etc. 47 papers (13 papers by the first/corresponding author), with a total of more than 2,100 citations, H index 22 (Google Scholar). At present, he is mainly engaged in the research of new energy materials and devices, including the preparation and optimization of lead halide perovskite films, the construction of high-efficiency formal mesoporous/planar perovskite photovoltaic devices, the exploration of the application of perovskite photovoltaic devices in adjacent spaces, and the flexibility Photovoltaic devices, etc.