標題: Simultaneous Observation of an Intraband Transition and Distinct Transient Species in the Infrared Region for Perovskite Solar Cells
作者: Narra, Sudhakar
Chung, Chih-Chun
Diau, Eric Wei-Guang
Shigeto, Shinsuke
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
公開日期: 7-Jul-2016
摘要: Solar cells based on organometal-halide perovskites such as CH3NH3PbI3 have emerged as a promising next generation photovoltaic system, but the underlying photo physics and photochemistry remain to be established because of the limited availability of methods to implement the simultaneous and direct measurement of various charge carriers and ions that play a crucial role in the operating device. We used nanosecond time-resolved infrared (IR) spectroscopy to investigate, with high molecular specificity, distinct transient species that are formed in perovskite solar cells after photoexcitation. In CH3NH3PbI3 planar-heterojuction solar cells, we simultaneously observed infrared spectral signatures that are associated with an intraband transition of conduction-band electrons, Fano resonance, and the spiro-OMeTAD cation having an exceptionally short lifetime of 1.0 mu s (at similar to 4485 cm(-1)). The present results show that the time resolved IR method offers a unique capability to elucidate these important transients in perovskite solar cells and their dynamic interplay in a comprehensive manner.
URI: http://dx.doi.org/10.1021/acs.jpclett.6b01111
http://hdl.handle.net/11536/133882
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.6b01111
期刊: JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume: 7
Issue: 13
起始頁: 2450
結束頁: 2455
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