Spontaneous Radiative Cooling to Enhance the Operational Stability of Perovskite Solar Cells via a Black-body-like Full Carbon Electrode

TL;DR

This paper demonstrates that integrating a full-carbon electrode in perovskite solar cells enables spontaneous radiative cooling, significantly reducing device temperature and enhancing operational stability without sacrificing efficiency.

Contribution

The study introduces a full-carbon electrode design that amplifies radiative cooling, leading to record efficiencies and improved stability in perovskite solar cells.

Findings

Achieved >19% and >23% efficiencies for CsPbI3 and hybrid perovskite cells.

Reduced operating temperature by about 10°C due to thermal radiation.

CsPbI3 PSCs showed no efficiency degradation after 2000 hours.

Abstract

Operational stability of perovskite solar cells is remarkably influenced by the device temperature, therefore, decreasing the interior temperature of the device is one of the most effective approaches to prolong the service life. Herein, we introduce the spontaneous radiative cooling effect into the perovskite solar cell and amplified this effect via functional structure design of a full-carbon electrode (F-CE). Firstly, with interface engineering, >19% and >23% power conversion efficiencies of F-CE based inorganic CsPbI3 and hybrid perovskite solar cells have been achieved, respectively, both of which are the highest reported efficiencies based on carbon electrode and are comparative to the results for metal electrodes. Highly efficient thermal radiation of this F-CE can reduce the temperature of the operating cell by about 10 {\deg}C. Compared with the conventional metal electrode-based control cells, the operational stability of the above two types of cells have been significantly improved due to this cooling effect. Especially, the CsPbI3 PSCs exhibited no efficiency degradation after 2000 hours of continuous operational tracking.