Proceedings of Online Meetup: Contemporary Stability Challenges in Hybrid Perovskite Photovoltaics (SCHP)
Publication date: 14th April 2020
The easy bandgap tunability of mixed-halide perovskite makes them promising candidate for LEDs and tandem solar cells. However, illuminating the material results in formation of halide-rich phases. Similarly, pure halide compositions suffer of halide migration reducing the long-term stability. Activation energies reported for the two processes are comparable suggesting vacancy-mediated anion transport in both cases. We investigate the kinetics of phase segregation in MAPb(BrxI1-x)3 (xbr-= 0.5) by transient absorption spectroscopy under hydrostatic pressure using an additional light beam to induce the segregation. We observe a slower build-up of halide-rich phase when the pressure increases from ambient pressure to 0.3 GPa where halide segregation is slow enough to be almost suppressed. We interpret this as a change in the activation energy as the logarithm of the segregation rate follows the same trend as the theoretical activation energy under pressure. This would suggest that a similar approach may be used to suppress halide migration in pure system.
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