Hole-conductor-free perovskite solar cells
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troduction Metal-halide perovskite solar cells (PSCs) have become a focus of great interest among photovoltaics. With worldwide researchers’ contributions over the last decade, the powerconversion efficiency (PCE) has soared to 25.2%,1 close to the value of monocrystalline silicon solar cells. This striking performance is attributed to superior optical and electronic properties of perovskites. In addition to the high efficiency, halide perovskites are cost effective and solution processable. While high efficiency and low cost are attractive for commercializing PSCs, unfortunately, the issue of poor stability shadows their access to the market. Stability of PSCs is determined by the perovskite material itself together with the charge-transporting materials and electrode materials. Hole-transporting material (HTM) in a PSC extracts holes and transports them to the electrode. Numerous studies have demonstrated that organic HTMs, such as 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl) amino]-9,9′-spirobifluorene (Spiro-OMeTAD), which is generally applied in PSCs for high efficiency, greatly restrict the stability of PSCs.2–4 Removing HTM from PSCs is a promising strategy to solve this concern. Fortunately, halide perovskite materials exhibit good hole and electron-transport properties. PSCs with zero HTM, known as hole-conductor-free
perovskite solar cells, have been successfully developed and widely studied. Here, we summarize current progress in hole-conductor-free PSCs according to their configuration, including conventional mesoscopic hole-conductor-free PSCs, conventional planar hole-conductor-free PSCs, inverted planar hole- conductorfree PSCs, and printable triple mesoscopic hole-conductorfree PSCs. We also discuss the advantages of printable triple mesoscopic hole-conductor-free PSCs in stability and upscaling, and outline future prospects for further development of hole-conductor-free PSCs.
Configurations for hole-conductor-free PSCs A typical PSC consists of a window electrode, an electrontransporting layer (ETL), a perovskite-absorber layer, a holetransporting layer (HTL), and a back electrode. When the ETL is deposited on the window electrode, the PSC is usually called the conventional type. It is called the inverted type if the ETL is deposited on the perovskite layer. If one layer in the device is mesoscopic, it is termed a mesoscopic PSC. With the removal of the HTL from a typical PSC, a hole-conductorfree PSC is realized. There are four main configurations of hole-conductor-free PSCs, namely conventional mesoscopic
Deyi Zhang, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, China; [email protected] Yaoguang Rong, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, China; [email protected] Yue Hu, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, China; [email protected] Anyi Mei, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technolo
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