Ternary Blend Organic Solar Cells: Understanding the Morphology from Recent Progress

• Published in: Advanced materials (Weinheim) Vol. 34; no. 46; pp. e2107476 - n/a
• Main Authors: Xu, Xiaopeng, Li, Ying, Peng, Qiang
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01-11-2022
• Subjects: Acceptor materials; Materials science; Miscibility; Mixtures; Morphology; Parameters; Phase separation; Photovoltaic cells; progress; Solar cells; solubility; ternary blend solar cells; Vertical separation; progress; solubility; miscibility; morphology; ternary blend solar cells
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.202107476

Ternary blend organic solar cells (TB‐OSCs) incorporating multiple donor and/or acceptor materials into the active layer have emerged as a promising strategy to simultaneously improve the overall device parameters for realizing higher performances than binary devices. Whereas introducing multiple materials also results in a more complicated morphology than their binary blend counterparts. Understanding the morphology is crucially important for further improving the device performance of TB‐OSC. This review introduces the solubility and miscibility parameters that affect the morphology of ternary blends. Then, this review summarizes the recent processes of morphology study on ternary blends from the aspects of molecular crystallinity, molecular packing orientation, domain size and purity, directly observation of morphology, vertical phase separation as well as morphological stability. Finally, summary and prospects of TB‐OSCs are concluded.
This review briefly introduces the solubility and miscibility parameters that affect the morphology of ternary blends and then summarizes the recent processes of morphology study on ternary blends from the aspects of molecular crystallinity, molecular packing orientation, domain size and purity, vertical phase separation, direct observation of the morphology as well as morphological stability.