Metal‐Nanowire‐Electrode‐Based Perovskite Solar Cells: Challenging Issues and New Opportunities

Recently, organometal halide perovskite (OMHP)‐based solar cells have been regarded as one of the most promising technologies in the research field of renewable energy applications. Along with successful demonstrations of high power conversion efficiencies (PCEs), various characteristic strategies for fabricating functional OMHP‐based solar cells have been exploited to facilitate both their practical applicability and industrial suitability. As a part of such efforts, unconventional transparent conductive electrodes have been suggested based on the implementation of metal nanowires (MeNWs), which possess both high transparency and low sheet resistance, in order to replace traditional counterparts such as costly, limitedly‐flexible vacuum‐deposited conductive metal oxides. This allows for the facile fabrication of solution‐processable, low‐cost, highly flexible, high‐performance solar cell devices. In this review, the recent progress on OMHP solar cells integrated with MeNW‐network electrodes is investigated and the challenges associated with the integration of MeNW‐network electrodes are comprehensively addressed with the suggestion of possible solutions for resolving the critical issues. Integration between metal nanowire network‐based electrodes and perovskite solar cells enables diversification of fabrication processes and functionalities of perovskite solar cells. High‐performance, semi‐transparent, and flexible perovskite solar cells with metal nanowires are expected to be fabricated without resorting to vacuum processes. The challenging issues facing the integration are also investigated.