Abstract In the last 12 years, conventional solar cells, especially silicon-based, have increased their efficiency by 1.1; however, the energy transformation efficiency of perovskite-based photovoltaics has reached from 3.8 to 25.7 within the same time frame. Perovskite solar cells have been evolved as captivating domain of research in recent years by virtue of phenomenal intrinsic properties exhibited by perovskite materials and gradual optimization of hole transport layer along with perovskite film. This review paper elaborates various materials utilized as hole transport layers in perovskite solar cells. Firstly, the origin of perovskite-based cells is described followed by their configuration/ structure. The paper then elaborates the function of hole transport layer in improving the performance of perovskite solar cells. Further, it throws light on categorization of hole transport materials in organic and inorganic group including their advantages and disadvantages. Particularly, the organic hole transport materials, viz. PTAA, PEDOT:PSS, P3HT, Spiro-OMeTAD, and inorganic hole transport materials, viz. CuOx, CuSCN, CuI, NiOx and transition metal dichalcogenides (TMDs) were briefly elaborated. Through this review paper, the design and applications of recently synthesized hole transport materials that promote the device performance of perovskite solar cells have been also discussed.
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