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Self-Assembled Monolayer (SAM) Forming Hole Transport Materials

No.184(Aug. 2020)
2PACz (1)
MeO-2PACz (2)
 Perovskite solar cells have developed significantly over the last 10 years, since the first report was published by Miyasaka et al.1) The power conversion efficiency has been demonstrated to be 25.2% for a small cell, 16.09% for a module, and 29.15% for a perovskite/silicon tandem.2) One of the main bottlenecks to large-scale production is the hole transport layer. Many researchers have undertaken the challenged of stabilizing and upscaling perovskite solar cells for practical use. Conventional hole-transport materials such as Spiro-OMeTAD and PTAA are expensive and are destabilized by the addition of dopants to provide carrier transport.
 Recently, Getautis and Albrecht et al. have developed the hole-selective self-assembled monolayer (SAM) forming agents, 2PACz (1) and MeO-2PACz (2), for high-performance perovskite solar cells. 1 and 2 can form a monolayer on a metal oxide surface anchored by a phosphonic acid moiety. These materials are useful for tandem solar cell because they make allow conformal coverage of rough surfaces. A perovskite solar cell using a SAM hole transport layer can realize more than 20% efficiency without any dopants, and is very cost effective due to the extremely low material consumption.3)


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