Charge-carrier dynamics in Organic Photovoltaic Materials
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The microscopic electron-donor and acceptor domains and their blend interfaces are the main sites for free-charge generation and transport. Therefore, the molecular packing and nanoscale morphology of the active layer play an important role for a device performance in organic optoelectronics including photovoltaics. We utilized flash-photolysis time-resolved microwave conductivity (FP-TRMC) experiments to explore Charge-carrier dynamics in Organic Photovoltaic Materials. FP-TRMC is an electrodeless photoconductivity measurement which can figure out carrier information like carrier generation yield (ϕ), mobilities (∑μ = μe + μh, the sum of electron/hole mobilities), and recombination dynamics. we compared charge-carrier dynamics of a P3HT-NDI polymer dyad with the one of self-assembly of P3HT and P3HT/NDI blend by the experiments. Also, we confirmed that the presence of MXene in the photoactive layer leads to improving free-charge generation by facilitates polaron pair dissociation.