Simultaneous Observation of an Intraband Transition and Distinct Transient Species in the Infrared Region for Perovskite Solar Cells | Zendy

Sudhakar Narra | Zendy; ChihChun Chung | Zendy; Eric WeiGuang Diau | Zendy; Shinsuke Shigeto | Zendy

Open Access

Simultaneous Observation of an Intraband Transition and Distinct Transient Species in the Infrared Region for Perovskite Solar Cells

Author(s) -

Sudhakar Narra,

ChihChun Chung,

Eric WeiGuang Diau,

Shinsuke Shigeto

Publication year - 2016

Publication title -

the journal of physical chemistry letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.563

H-Index - 203

ISSN - 1948-7185

DOI - 10.1021/acs.jpclett.6b01111

Subject(s) - photoexcitation , perovskite (structure) , nanosecond , optoelectronics , infrared , photovoltaic system , materials science , ultrafast laser spectroscopy , infrared spectroscopy , spectroscopy , halide , charge carrier , electron , transient (computer programming) , chemical physics , photochemistry , chemistry , optics , excitation , laser , physics , inorganic chemistry , crystallography , computer science , ecology , organic chemistry , quantum mechanics , biology , operating system

Solar cells based on organometal-halide perovskites such as CH3NH3PbI3 have emerged as a promising next-generation photovoltaic system, but the underlying photophysics 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 μs (at ∼1485 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.

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