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15 March 2023 Probing carrier transport in MAPbI3-based photovoltaic cells with nonlinear photocurrent spectroscopy
Zhenyu Ouyang, Liang Yan, Wei You, Andrew Moran
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Proceedings Volume PC12419, Ultrafast Phenomena and Nanophotonics XXVII; (2023) https://doi.org/10.1117/12.2649182
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
Layered organohalide perovskite films consist of quantum wells with concentration distributions tailored to enhance charge transport. Whereas cascaded energy and charge funneling behaviors have been detected with conventional optical spectroscopies, it is not clear that such dynamics contribute to the efficiencies of photovoltaic cells. Experimental methods based on a wide range of physical principles are used to determine carrier mobilities for light-harvesting materials in photovoltaic cells. For example, in a time-of-flight experiment, carrier transport is initiated by a single pulse of light, and the timescale of carrier transport across the active layer of a device is determined. With our newly developed multidimensional Time-Of-Flight (TOF) named nonlinear photocurrent spectroscopy (NLPC), transient populations of quantum wells with different sizes are established by tuning the wavelengths of the laser pulses into their respective electronic resonances. Multidimensional TOF data suggest that such light-harvesting processes do not assist long-range charge transport due to carrier trapping at interfaces between quantum wells and interstitial organic spacer molecules. Further, the measured instantaneous drift velocities show that trap-induced carrier deceleration is more evident with higher concentrations of organic spacer cations. Overall, our measurements indicate that the majority of photocurrent is produced when the thickest quantum wells absorb light and transport carriers without charge transfer transitions involving smaller quantum wells.
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Zhenyu Ouyang, Liang Yan, Wei You, and Andrew Moran "Probing carrier transport in MAPbI3-based photovoltaic cells with nonlinear photocurrent spectroscopy", Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2649182
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KEYWORDS
Solar cells
Spectroscopes
Pulsed laser operation
Instrument modeling
Laser development
Nonlinear response
Picosecond phenomena
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