Highly efficient and thermally stable inverted CH3NH3PbI3 (MAPbI3) and HC(NH2)2PbI3-xBrx (FAPbI3-xBrx) perovskite planar solar cells are demonstrated by using a N,N′-bis(phenylmethyl)naphthalene-1,4,5,8-tetracarboxylic diimide (NDI-PM)-based electron transporting material (ETM) instead of a conventional fullerene-based phenyl-C61-butyric acid methyl ester (PCBM) ETM. The MAPbI3 and FAPbI3-xBrx devices with the NDI-PM-based ETM exhibit 18.4% and 19.6% power conversion efficiency under an illumination of 1 Sun (100 mW cm-2), respectively, which are comparable to the efficiency of PCBM ETM-based ones (18.9% and 20.0%). The improved thermal stability of NDI-based perovskite solar cells is attributed to much stronger hydrogen bonds in the NDI-PM molecular crystals than the PCBM crystals.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)