Ultrafast transient Stark and THz spectroscopic investigation of carrier dynamics in perovskite single crystals and films

Arun Paraecattil^a

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Arun Paraecattil, 439
Publication date: 5th February 2015

We leverage ultrafast transient Stark spectroscopy, Time-resolved THz measurements and optical pump-probe spectroscopy to comprehensively investigate the photo-physical properties of carriers in single crystals and vapor deposited films of organic-inorganic lead halide Perovskites. In transient stark spectroscopy we use the electric field induced shift of the absorption spectrum of a material to investigate the evolution of carrier dynamics and mobilities in the femtosecond time domain. In addition, an applied bias allows us to investigate materials used in electronic applications under environments that more closely mimic their operating conditions and hence observe phenomena that uniquely arise under these conditions. Extraordinarily we observe the appearance of spectral features after screening of the field that indicates that the accumulation of carriers at the electrodes could result in carrier induced doping. In addition optical pump-probe and THz measurements have been used to investigate carrier dynamics.

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