Publication date: 15th December 2025
Hot carrier solar cells have gained increasing attention due to their potential for achieving high-efficiency solar cells. With phonon regulation in perovskite materials, the hot carrier lifetime and initial carrier temperature can be significantly enhanced. Therefore, exploring methods to regulate electron-phonon coupling in perovskite materials may be an effective approach to advancing hot carrier strategy. By introducing various alkyl chains, the hot carrier lifetime can be improved. Using ultrafast transient spectroscopy, the relaxation and surface recombination kinetics of hot carriers can be measured. According to the transient kinetic results, perovskite materials with the highest entropy A-site cations exhibit the highest initial carrier temperature, longest carrier relaxation time, and slowest hot carrier relaxation rate. As the entropy of the A-site cations increases, perovskite materials show a trend of increasing initial carrier temperature and phonon emission time. This behavior can be attributed to the reduced electron-phonon coupling strength caused by the entropy increase of the A-site cations. Our findings demonstrate the potential of using high-entropy cations to drive hot carrier perovskite solar cells.
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