Carrier dynamics in planar perovskite photovoltaics with dual nanocomposite carrier transport layers studied by femtosecond spectroscopy

JiaXing Li^1*, Hsi-Kuei Lin², Kaung-Hsiung Wu¹

¹electrophysics, National Chiao Tung University, Hsinchu, Taiwan
²Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan

* Presenter:JiaXing Li, email:pupuever@gmail.com

In the present study, planar perovskite photovolta-ics that incorporate dual nanocomposite carrier transport layers have been fabricated. The electron transport layer (ETL) comprising PC61BM doped with Bphen, while the hole transfer layer (HTL) compris-ing PEDOT:PSS doped with MoS2 nanosheets were used to enhance the electron and hole mobility, respec-tively. The carrier dynamics of this device and the corresponding control device prepared with pristine layers were measured by femtosecond transient ab-sorption spectroscopy. It was found that a smaller car-rier recombination and injection lifetime in the double modified carrier transport layers perovskite solar cell, resulting in great enhancement (~57%) of the power conversion efficiency (PCE).

Keywords: photovoltaics, femtosecond spectroscopy, Carrier dynamic