Boosting the Fill Factor through Sequential Deposition and Homo Hydrocarbon Solvent toward Efficient and Stable All-Polymer Solar Cells
Journal
Advanced Energy Materials
Journal Volume
12
Journal Issue
48
Date Issued
2022-12-22
Author(s)
Wang, Yan
Yu, Han
Wu, Xin
Zhao, Dan
Zhang, Shoufeng
Zou, Xinhui
Li, Bo
Gao, Danpeng
Li, Zhen
Xia, Xinxin
Chen, Xiankai
Lu, Xinhui
Yan, He
Jen, Alex K.Y.
Zhu, Zonglong
Abstract
All-polymer solar cells (all-PSCs) have achieved impressive progress in photovoltaic performance and stabilities recently. However, their power conversion efficiencies (PCEs) still trail that of small-molecular acceptor-based organic solar cells (>19%) mainly because of the inferior fill factor (FF). Herein, a combined homo hydrocarbon solvent and sequential deposition (SD) strategy is presented to boost the FF of rigid all-PSCs to 77.7% and achieve a superior PCE of 17.7% with excellent stability, which is among the highest efficiencies reported for all-PSCs thus far. Meanwhile, a remarkable PCE of 14.5% is realized for flexible all-PSCs with outstanding mechanical stability. The blend film morphologies measurements suggest that the SD method enables the formation of an ideal pseudo-bilayer film with bicontinuous interdigitated structure and ordered polymer packing. The numerical simulation result indicates that the FF enhancement mainly results from the efficient exciton diffusion dynamics, increased carrier mobilities, and more balanced electron/hole mobility ratio induced by the developed SD method. This is also confirmed by the FF loss analysis, which manifests that the reduced series resistance and increased shunt resistance are the main reasons for the reduction of FF loss. This work provides a promising strategy to fabricate highly efficient and stable all-PSCs to promote their future development and practical manufacturing.
Subjects
all-polymer solar cells | device stablilities | fill factor | high efficiency | homo hydrocarbon solvents | sequential deposition
Publisher
WILEY-V C H VERLAG GMBH
Type
journal article