Zhang, FeiYi, ChenyiWei, PengBi, XiangdongLuo, JingshanJacopin, GwenoleWang, ShirongLi, XianggaoXiao, YinZakeeruddin, Shaik MohammedGratzel, Michael2016-10-182016-10-182016-10-18201610.1002/aenm.201600401https://infoscience.epfl.ch/handle/20.500.14299/130471WOS:000381693700009A Novel Dopant-Free Triphenylamine Based Molecular "Butterfly" Hole-Transport Material for Highly Efficient and Stable Perovskite Solar Cellstext::journal::journal article::research article