A Simple 3,4-Ethylenedioxythiophene Based Hole-Transporting Material for Perovskite Solar Cells

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. Heterocycle power! A power‐conversion efficiency of 13.8 % under AM 1.5G illumination was achieved in a perovskite‐based solar cell with a new hole‐transporting material based on 3,4‐ethylenedioxythiophene (H101). This is the first heterocycle‐containing material with >10 % efficiency in such devices, and has great potential to replace the more expensive spiro‐OMeTAD, given its much simpler and less expensive synthesis.