ma8b00919_si_001.pdf (2.63 MB)
Two Anthracene-Based Copolymers as the Hole-Transporting Materials for High-Performance Inverted (p-i-n) Perovskite Solar Cells
journal contribution
posted on 2018-09-14, 13:22 authored by Tong Tong, Chao Tan, Tina Keller, Bobo Li, Chaoyue Zheng, Ullrich Scherf, Deqing Gao, Wei HuangTwo
anthracene-based copolymers, the thiophene-bridged carbazole-anthracene
copolymer (abbreviated as PCBZANT) and the thiophene-bridged
triphenylamine-anthracene copolymer (abbreviated as PTPAANT), have been developed as the hole-transporting materials (HTMs)
for the inverted perovskite solar cells. They were thermally stable
with decomposition temperatures of 435 and 420 °C. The High Occupied
Molecular Orbitals (HOMO) of −5.15 and −5.24 eV of two
copolymers facilitated the hole carriers transfer from the perovskite
layer (CH3NH3PbI3, HOMO: −5.4
eV) in contrast to poly(3,4-ethylenedioxythiophene):polystyrenesulfonate
(PEDOT:PSS, HOMO: −4.9 eV). The solar cell with PCBZANT (abbreviated as the PCBZANT device) showed the highest
power conversion efficiency (PCE) of 15.50%, while the cell with PTPAANT (abbreviated as the PTPAANT device) showed
the highest PCE of 14.52%, with increases of 36.2% and 27.6%, respectively,
relative to the PEDOT:PSS device. The thorough analysis disclosed
that the high performance was mainly ascribed to the enhanced open-circuit
voltage (VOC) and short-circuit current
density (JSC), being contributed from
the efficient hole-carrier extraction, the high hole mobility of two
copolymers, and the high-quality perovskite film with large crystal
size and less defect. With strong absorption in the range of 350–500
nm, the polymers decreased the destruction of UV-radiation on the
perovskite layer as UV-filters and improved the stability of the inverted
cells.