Abstract
Organic-inorganic metal halide perovskites have recently shown great potential for application, due to their advantages of low-cost, excellent photoelectric properties and high power conversion efficiency. Perovskite-based thin film solar cells have achieved a power conversion efficiency (PCE) of up to 20%. Hole transport materials (HTMs) are one of the most important components of perovskite solar cells (PSCs), having functions of optimizing interface, adjusting the energy match, and helping to obtain higher PCE. Inorganic p-type semiconductors are alternative HTMs due to their chemical stability, higher mobility, high transparency in the visible region, and applicable valence band (VB) energy level. This review analyzed the advantages, disadvantages, and development prospects of several popular inorganic HTMs in PSCs.
Highlights
Perovskite solar cells (PSCs) based on organic-inorganic metal halide perovskites have recently attracted considerable attention as the power conversion efficiency (PCE) has increased dramatically from the initial 3.9% in 2009 to current 22.1% in a short span of several years [1,2,3,4,5,6,7,8]
There are some general requirements for inorganic Hole transport materials (HTMs) used in PSCs, such as high transparency in the visible region, well chemical stability, higher mobility, and applicable valence band (VB) energy level
These improvements contribute to the increase of stability and PCE of PSCs compared to the cells employing only PEDOT:PSS
Summary
Perovskite solar cells (PSCs) based on organic-inorganic metal halide perovskites have recently attracted considerable attention as the power conversion efficiency (PCE) has increased dramatically from the initial 3.9% in 2009 to current 22.1% in a short span of several years [1,2,3,4,5,6,7,8]. While a mass of efforts such as solvent additives, molecular dipoles, or interface modification has been devoted to optimize device efficiency, none of the present PSCs provides high PCE with long-term stability. Compared to organic HTMs, inorganic p-type semiconductor materials have the advantages of high hole mobility, wide band gap, low cost, and solution-processed availability, which show promising prospects as hole-selective contacts in perovskite solar cells
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