TY - JOUR
T1 - Multilayer Cascade Charge Transport Layer for High-Performance Inverted Mesoscopic All-Inorganic and Hybrid Wide-Bandgap Perovskite Solar Cells
AU - Chen, Yu
AU - Tang, Weijian
AU - Wu, Yihui
AU - Yuan, Ruihan
AU - Yang, Jianchao
AU - Shan, Wenjuan
AU - Zhang, Shengli
AU - Zhang, Wen Hua
N1 - Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/10/1
Y1 - 2020/10/1
N2 - It is imperative to improve the quality of light absorber and reduce the charge-carrier recombination for efficient perovskite solar cells (PSCs). Herein, a synergistic regulation strategy that combines the tailoring of crystallinity and construction of multilayer cascade charge transport layers (CTLs) for inverted CsPbI2Br solar cells is presented. The film quality of CsPbI2Br is well tuned via F− doping. In addition, gradient energy alignment between perovskite and CTLs, i.e., NiOx/Zn:CuGaO2/perovskite and perovskite/TiO2/PC61BM/ZnO, favors the charge transfer and depresses carrier recombination. Noticeably, the TiO2 interlayer with deep valence band maximum effectively blocks the hole back-transfer from perovskite to PC61BM. These unique characteristics of the novel structured CsPbI2Br device give a champion power conversion efficiency (PCE) of 15.10% along with good thermal and operational stability. Moreover, the graded CTLs can be expanded to methylammonium-free hybrid perovskite device (Eg = ≈1.76 eV) by delivering a PCE of 18.12%, showing great promise in tandem solar cells for use as top cell.
AB - It is imperative to improve the quality of light absorber and reduce the charge-carrier recombination for efficient perovskite solar cells (PSCs). Herein, a synergistic regulation strategy that combines the tailoring of crystallinity and construction of multilayer cascade charge transport layers (CTLs) for inverted CsPbI2Br solar cells is presented. The film quality of CsPbI2Br is well tuned via F− doping. In addition, gradient energy alignment between perovskite and CTLs, i.e., NiOx/Zn:CuGaO2/perovskite and perovskite/TiO2/PC61BM/ZnO, favors the charge transfer and depresses carrier recombination. Noticeably, the TiO2 interlayer with deep valence band maximum effectively blocks the hole back-transfer from perovskite to PC61BM. These unique characteristics of the novel structured CsPbI2Br device give a champion power conversion efficiency (PCE) of 15.10% along with good thermal and operational stability. Moreover, the graded CTLs can be expanded to methylammonium-free hybrid perovskite device (Eg = ≈1.76 eV) by delivering a PCE of 18.12%, showing great promise in tandem solar cells for use as top cell.
KW - charge transport layers
KW - charge-carrier transfer
KW - crystallization tailoring
KW - energy alignment
KW - perovskite solar cells
UR - https://www.scopus.com/pages/publications/85089361118
U2 - 10.1002/solr.202000344
DO - 10.1002/solr.202000344
M3 - Article
AN - SCOPUS:85089361118
SN - 2367-198X
VL - 4
JO - Solar RRL
JF - Solar RRL
IS - 10
M1 - 2000344
ER -