通过构建多光学腔协同均化并增强光生电场以实现高效钙钛矿太阳能电池

Abstract Perovskite solar cells (PSCs) have emerged as a promising photovoltaic technology due to their tunable bandgap, high absorption, and low cost. However, the spatially inhomogeneous photogenerated electrical field within PSCs hampers their efficiency and stability. To address this issue, we propose a novel multi-optical-cavity structure inspired by Fabry-Perot cavity. By integrating a metallic light-diffusing reflector (LDR) within the photoactive layer to collaborate with the nanostructures at the front/rear part of the device, based on stimulating surface plasmon resonance, incident light is scattered and reflected multiple times to homogenize the photon spatial distribution, finally forming multi-optical-cavity above/beneath LDR. This design effectively upgrades the uniformity of photogenerated electrical field and absorption efficiency of the photoactive layer, achieving a short-circuit current density ( J SC ) of 26.55 mA/cm 2 and a power conversion efficiency ( PCE ) of 29.72 % for a 200 nm thick photoactive layer. Moreover, the multi-optical-cavity structure exhibits robust omnidirectional light management and tolerance to LDR positional variations. This work provides theoretical insights into light-nanostructure interactions and offers a practical strategy for advancing high-performance optoelectronic devices.