Efficient and thermally stable inverted perovskite solar cells by introduction of non-fullerene electron transporting materials

다국어 초록 (Multilingual Abstract)

<▼1><P>Highly efficient and thermally stable inverted MAPbI3 and FAPbI3−xBr<I>x</I> perovskite planar solar cells are demonstrated by using a <I>N</I>,<I>N</I>′-bis(phenylmethyl)naphthalene-1,4,5,8-tetracarboxylicdiimide (NDI-PM)-based electron transporting material (ETM) instead of a conventional PCBM-based ETM.</P></▼1><▼2><P>Highly efficient and thermally stable inverted CH3NH3PbI3 (MAPbI3) and HC(NH2)2PbI3−xBrx (FAPbI3−xBrx) perovskite planar solar cells are demonstrated by using a <I>N</I>,<I>N</I>′-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<SUP>−2</SUP>), 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.</P></▼2>