Alleviating the Angular Dependence of Perovskite Solar Cells via Light Harvesting Nanostructure

Over the past decade, perovskite solar cells (PSCs) have witnessed a remarkable surge in power conversion efficiency (PCE). However, the electrical output performance of PSCs is dependent on the incident angle of solar radiation, and energy loss occurs during photovoltaic conversion when light impinges at angles. Here, a perovskite light absorbed layer with inverse opal structure was used to fabricate PSCs and reduce the angular dependence of the performance. The results demonstrate that ordered periodic perovskite inverse opal (PVSK‐IO) not only exhibits a remarkable slow‐photon effect for enhancing the absorption of sunlight near the photonic band gap (PBG), but also promotes the carrier transfer by expanding the contact area with hole transport layer. Moreover, the slow photon region of PBG could be intentionally tuned by changing the direction of sunlight illumination, thereby more intuitively delaying and storing light in the PVSK‐IO layer. As a consequence, the slow‐photon effect originated from the PVSK‐IO structure efficiently improved the short‐circuit current density (J_SC), resulting in a higher PCE than that of planar devices under the irradiation from different incident angles. Our research offers a rational strategy for enhancing the performance of PSCs while alleviating their angular dependence.

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