Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.038
Publication date: 27th October 2017
We set up and developed a new spectroscopy apparatus for measuring the photo-induced change in the reflection and transmission from thin films of optoelectronic materials. We then carry out a photophysical study on charge transport phenomena at the perovskite solar cell absorber materials. By focusing on changes in spectra below band-edge of perovskite materials, we observe a sub bandgap bleaching [1], band filling [2], and free carrier absorption [3]. Changes in transmittance and reflectance of materials at sub-bandgap is originated from charge density changes in perovskite. A simulation data set of fractional changes in transmission and reflection was obtained through transfer-matrix method based on Kramer-Kronig relationship [3], and this simulation data clearly supports our suggestion from experimental data that the charge generation in perovskite is strongly related to refractive index change. It is possible to combine with photoconductivity for mobility calculation. Thus effective mobility was obtained by calculating carrier density from Drude model and quasi steady state photoconductivity. This work lead to a much improved understanding of the electronic processes occurring at sub-bandgap of photovoltaic junction. Scientific findings through advanced spectroscopy apparatus may provide some clues to understand optoelectronic properties of heterogeneous interfaces as well as fundamental properties of perovskite, by analysing those complicated sets of experimental data, considering many possible explanations, and employing experimental methodology.
References
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[2] J. S. Manser and P. V. Kamat, Nature Photon. (2014), 8, 737.
B. R. Bennett, R. A. Soref and J. A. Del Alamo, IEEE J. Quantum Electron. (1990), 26, 113.
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