Abstract
A triphenylamine based molecular “butterfly” is developed as dopant‐free hole‐transport material for perovskite solar cells exhibiting excellent power conversion efficiency of 16.3% which is comparable to the state‐of‐the‐art doped 2,2′,7,7′‐tetrakis(N,N′‐di‐p‐methoxy‐phenylamine)‐9,9′‐spirobifluorene (spiro‐OMeTAD). Moreover, the device is much more stable than that of spiro‐OMeTAD based device under light irradiation.