Baseplate Temperature‐Dependent Vertical Composition Gradient in Pseudo‐Bilayer Films for Printing Non‐Fullerene Organic Solar Cells. Issue 45 (17th October 2021)

• Record Type: Journal Article
• Authors: Zheng, Yina; Sun, Rui; Zhang, Meng; Chen, Zhihao; Peng, Zhengxing; Wu, Qiang; Yuan, Xinxin; Yu, Yue; Wang, Tao; Wu, Yao; Hao, Xiaotao; Lu, Guanghao; Ade, Harald; Min, Jie
• Is Part Of: Advanced energy materials. Volume 11:Issue 45(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-17
• Subjects: D/A mixed region -- morphology evolution -- organic solar cells -- processing temperature -- sequential deposition technology; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202102135
• Languages: English
• ISSNs: 1614-6832

Abstract

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. Abstract : The baseplate temperature‐dependent blend morphology of sequential deposition‐processed organic solar cells at vertical and lateral scales is systematically studied, and the temperature‐microstructure‐performance relationship is established.