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5 March 2021 Time-resolved photoconductivity mapping in 2D materials and perovskite solar cells
Keji Lai
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Proceedings Volume 11684, Ultrafast Phenomena and Nanophotonics XXV; 116841F (2021) https://doi.org/10.1117/12.2576104
Event: SPIE OPTO, 2021, Online Only
Abstract
We report the spatiotemporal photoconductivity imaging on monolayer semiconductors and perovskite solar cell thin films by laser-illuminated microwave impedance microscopy (iMIM). With a spatial resolution of sub-100 nm and a temporal resolution of sub-10 ns, we are able to quantitatively measure the diffusion length and lifetime of photo-generated free carriers in these materials. The results are in good agreement with the diffusion equation and Einstein relation. Our work reveals the intrinsic time and length scales of electrical response to photo-excitation in optoelectronic van der Waals systems and photovoltaic materials.
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Keji Lai "Time-resolved photoconductivity mapping in 2D materials and perovskite solar cells", Proc. SPIE 11684, Ultrafast Phenomena and Nanophotonics XXV, 116841F (5 March 2021); https://doi.org/10.1117/12.2576104
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KEYWORDS
Perovskite
Solar cells
Semiconductors
Diffusion
Chemical vapor deposition
Microscopy
Microwave radiation
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