The dominant roles of the seed template in driving controllable growth of perovskite crystal

Hybrid organic-inorganic perovskite solar cells have attracted considerable attention over the past decade, delivering high power conversion efficiencies over 25%. There still exist challenges regarding precisely regulating perovskite crystallization kinetics due to the random nucleation and disordered diffusion growth in the spontaneous solution chemical reaction process, subsequently leading to poor film quality with chaotic microstructure arrangement and undesired defect states which compromises the photovoltaic performance. Recently, the research priority in the perovskite photovoltaic community has put emphasis on seed templates driving controllable growth of perovskite film, triggering excitement for novel manufacturing technologies. Herein, we provide a systematic overview covering the current pioneering works to comprehend the advances of seed template regulation approaches and the underlying mechanism in terms of microstructure evolution and optoelectronic properties. The intense search regarding constructing representative perovskite single and polycrystalline crystals is provided to elaborate on the prominent roles of seed templates.