Modeling of Charge Injection, Recombination, and Diffusion in Complete Perovskite Solar Cells on Short Time Scales
Krzysztof Szulc,
Katarzyna Pydzińska-Białek,
Marcin Ziółek
Abstract:A model of charge population decay upon ultrafast optical pulse excitation in complete, working perovskite solar cells is proposed. The equation, including charge injections (extractions) from perovskite to contact materials, charge diffusion, and charge recombination via first-, second-, and third-order processes, is solved using numerical simulations. Results of simulations are positively verified by broadband transient absorption results of mixed halide, triple-cation perovskite (FA0.76MA0.19Cs0.05Pb(I0.81B… Show more
“…This decay at high pump fluence (25 μJ cm −2 ) reflects mainly the effect of second-order (radiative) recombination, while at low pump fluence (1 μJ cm −2 and 2.5 μJ cm −2 ) – also the contribution of charge extraction to contact materials (hole injection processes in this case). 66 It indicates that both the above processes (rate constants of recombination and hole extraction from the bulk phase to HTM) are not affected by the presence of MXene.…”
This work demonstrates the utilization of MXenes as a hole transport interfacial layer for performance and stability improvement in regular device (n–i–p) structures.
“…This decay at high pump fluence (25 μJ cm −2 ) reflects mainly the effect of second-order (radiative) recombination, while at low pump fluence (1 μJ cm −2 and 2.5 μJ cm −2 ) – also the contribution of charge extraction to contact materials (hole injection processes in this case). 66 It indicates that both the above processes (rate constants of recombination and hole extraction from the bulk phase to HTM) are not affected by the presence of MXene.…”
This work demonstrates the utilization of MXenes as a hole transport interfacial layer for performance and stability improvement in regular device (n–i–p) structures.
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