A simple 3,4-ethylenedioxythiophene based hole-transporting material for perovskite solar cells

• Main Authors: Mhaisalkar, Subodh Gautam, Li, Hairong, Fu, Kunwu, Hagfeldt, Anders, Grätzel, Michael, Grimsdale, Andrew C.
• Other Authors: Energy Research Institute @ NTU (ERI@N)
• Format: Article
• Language: English
• Published: 2014
• Subjects: DRNTU::Engineering::Materials::Photonics and optoelectronics materials
• Online Access: https://hdl.handle.net/10356/99894; http://hdl.handle.net/10220/19645
• Institution: Nanyang Technological University

We report a novel electron-rich molecule based on 3,4-ethylenedioxythiophene (H101). When used as the hole-transporting layer in a perovskite-based solar cell, the power-conversion efficiency reached 13.8 % under AM 1.5G solar simulation. This result is comparable with that obtained using the well-known hole transporting material 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD). This is the first heterocycle-containing material achieving >10 % efficiency in such devices, and has great potential to replace the expensive spiro-OMeTAD given its much simpler and cheaper synthesis.