Perovskite solar cells (PSCs), in which lead halide perovskite is used as a light absorber, have received increasing attention since Miyasaka’s first report in 2009.1) In recent years, the practical development of these PSCs has been conducted around the world because of their high power conversion efficiency (PCE) and the capability to fabricate them on a large scale by solution processes.
Carrier transport materials are key for achieving high PCE and high device stability in PSCs. Spiro-OMeTAD is most widely used as a standard hole transporting material (HTM) in conventional structure PSCs. However, Spiro-OMeTAD is too expensive for the mass production of PSCs. In addition, some additives such as LiTFSI, TBP, and Co(III) complexes, which are necessary to increase PCEs in Spiro-OMeTAD-based PSCs, may promote deterioration of the resulting devices. Therefore, cost-effective and additive-free HTMs are required for the practical development of PSCs. Given these issues, TOP-HTM-α1 (1) and TOP-HTM-α2 (2) have been developed as new HTMs.2) They are more cost-effective than conventional HTMs and work without any additives. The CH3NH3PbI3 PSCs based on 1 and 2 gave high PCEs of 15.0% and 16.6%, respectively. Furthermore, these devices exhibited higher stability than devices based on Spiro-OMeTAD under continuous 1 sun illumination (Figure 1).
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