Baseplate Temperature‐Dependent Vertical Composition Gradient in Pseudo‐Bilayer Films for Printing Non‐Fullerene Organic Solar Cells
Abstract
Numerous previous reports on the sequential deposition (SD) technique have demonstrated that this approach can achieve a p‐i‐n active layer architecture with an ideal vertical composition gradient, which is one of the critical factors that can influence the physical processes that determine the photovoltaic performance of organic solar cells. Herein, a commonly used photovoltaic system comprised of PM6 as a donor and Y6 as an acceptor is investigated with respect to sequential blade‐processing deposition to comprehensively explore the morphology characteristics as a function of baseplate temperature. A systematic study of the temperature‐dependent blend morphology elucidates the SD‐processed configuration merits and device physics behind temperature‐controlled degree of vertical composition gradient, and constructs the temperature‐microstructure‐property relationship for the corresponding photovoltaic parameters. The result shows, as the temperature increases, the morphology of the active layer has undergone a distinct evolution from the pseudo‐bulk heterojunction to a pseudo‐planar heterojunction and then to a pseudo‐planar bilayer, leading to a non‐monotonic correlation between baseplate temperature and device performance. This investigation not only reveals the importance of precisely controlling baseplate temperature for gaining vertical morphology control, but also provides a path toward rational optimization of device performance in the lab‐to‐fab transition.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 17, 2021
- Source ID
- 10.1002/aenm.202102135
Entities
People
- Guanghao Lu
- Harald Ade
- Jie Min
- Meng Zhang
- Qiang Wu
- Rui Sun
- Tao Wang
- Xiaotao Hao
- Xinxin Yuan
- Yao Wu
- Yina Zheng
- Yue Yu
- Zhengxing Peng
- Zhihao Chen
Organizations
- National Natural Science Foundation of China
- North Carolina State University
- Office of Basic Energy Sciences
- Office of Naval Research
- Office of Science
- Shandong University
- United States Department of Energy
- Wuhan University
- Xi'an Jiaotong University
- Zhengzhou University