Initial Photocarrier Generation Process in Organic Photovoltaics Observed with Light-Triggered Time-Domain Reflectometry
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE(2023)
Abstract
Herein, a time-resolved electrical measurement is developed to observe the transient impedance of organic photovoltaics (OPV) and traced the initial photocarrier generation dynamics with the time region from 10 ns to 190 & mu;s. A light-triggered time-domain reflectometry is adopted to observe the initial carrier dynamics in OPV by synchronizing rectangular light pulses from LED with a transient impedance probe pulse. Both the rising and recovery processes of OPV are observed in detail. The time evolution of the photocarrier distribution is calculated based on the diffusion-recombination scheme and is discussed in the initial process of photocarrier generation.
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Key words
organic photovoltaics,organic solar cell,photocarrier generation,time domain reflectometry
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