A simple and dopant-free hole-transporting material based on (2-ethylhexyl)-9H-carbazole for efficient planar perovskite solar cells

1. Zhang, J.
2. Xu, L.J.
3. Huang, P.
4. Zhou, Y.
5. Zhu, Y.Y.
6. Yuan, N.Y.
7. Ding, J.N.
8. Zhang, Z.G.
9. Li, Y.F.