极化子
红外线的
红外光谱学
材料科学
吸光度
光伏
光谱学
声子
化学物理
带隙
载流子
人口
振动耦合
吸收(声学)
光电子学
电子
分子物理学
化学
原子物理学
激发态
光伏系统
凝聚态物理
光学
物理
生态学
人口学
有机化学
量子力学
复合材料
社会学
生物
色谱法
作者
Valentina Carpenella,Claudia Fasolato,Diego Di Girolamo,Jessica Barichello,Fabio Matteocci,C. Petrillo,Danilo Dini,A. Nucara
标识
DOI:10.1021/acs.jpcc.3c03668
摘要
Hybrid organic-inorganic perovskites (HOIPs) have attracted considerable attention in the past years as photoactive materials for low-cost, high-performance photovoltaics. Polaron formation through electron-phonon coupling has been recognized as the leading mechanism governing charge carrier transport and recombination in HOIPs. In this work, two types of MAPbBr3 film samples deposited on different substrates (transparent insulating SrTiO3 and a heterostructure mimicking a functioning photovoltaic cell) were photoexcited with above-bandgap radiation at 450 nm, and the effects of illumination on the sample were analyzed in the infrared region. The infrared absorbance detected at different powers of the photoexciting laser allowed us to obtain an estimate of the characteristic decay time of photoexcited polaron population of the order of 100-1000 ns. When focusing on the absorption features of the MA molecular cation in the region of the NH stretching modes, we observed the influence of hydrogen bonding and the effect of the polaron dynamics on the cation reorientation.
科研通智能强力驱动
Strongly Powered by AbleSci AI