[14p-A41-1~9] Symposium of Photonics Division, "Researchers pioneering next-generation photonics"

[14p-A41-8] Characterization of Photoexcited Carrier Dynamics of Solar Cells by Using Time-Resolved Laser Spectroscopy
- Quantum Dot Solar Cells and Perovskite Solar Cells -

〇Qing Shen¹ (1.Univ. Electro-Commun.)

Keywords:photoexcited carrier dynamics, solar cell, time-resolved laser spectroscopy

As candidates of the next generation solar cells, colloidal quantum dot (CQD) based solar cells (CQDSCs) and perovskite solar cells have attracted considerable interest and developed rapidly during the past few years. CQDSCs have some unique advantages such as the band-gap tunability, high absorption coefficient, multiple exciton generation (MEG) possibility and low cost for preparation. The theoretical energy conversion efficiency of CQDSCs has been predicted to be about 44%. Very recently, the record energy conversion efficiency of CQDSCs has been improved to be as high as over 11%. On the other hand, the interest in organometal trihalide perovskite (CH₃NH₃PbI₃)-based solid-state hybrid solar cells has increased in recent years due to the high efficiencies achieved, with a record of over 22%, and the simple low temperature preparation method. To improve the photovoltaic performance of both CQDSCs and perovskite solar cells, a thorough understanding of the optical absorption properties, the photoexcited carrier lifetimes, and the charge separation and recombination dynamics at each interface is needed. In this talk, I would like to focus on the characterization of photoexcited carrier dynamics in the CQDSCs and perovskite solar cells using time-resolved laser spectroscopy, and the relationships between the photoexcited carrier dynamics and the photovoltaic properties. In addition, how to improve the efficiencies of the solar cells by controlling the nano-interfaces and the mechanism for the improvement of the energy conversion efficiency of CQDSCs will be discussed.