Triphenylamine (TPA)-Functionalized Structural Isomeric Polythiophenes as Dopant Free Hole-Transporting Materials for Tin Perovskite Solar Cells

Rajendiran Balasaravanan, Chun Hsiao Kuan, Shih Min Hsu, En Chi Chang, Yu Cheng Chen, Yi Tai Tsai, Meng Li Jhou, Shueh Lin Yau, Cheng Liang Liu, Ming Chou Chen, Eric Wei Guang Diau