High-performance and long-term stable inverted ternary solar cells based on PTB7-Th/N2200/PC71BM blends. (December 2018)

• Record Type: Journal Article
• Authors: Chen, Chih-Ping; Tsai, Yao-Yu; Chen, Yung-Chung; Li, Yan-Heng
• Is Part Of: Solar energy. Volume 176(2018)
• Page Start: 170
• Page End: 177
• Publication Date: 2018-12
• Subjects: Inverted device -- Morphology -- Ternary organic solar cells -- Thermal stability; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2018.10.038
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlights: Achieving good cell performance and high thermal stability of inverted ternary organic solar cell based on a single polymer donor (PTB7-Th) and two acceptors: one a polymer (N2200) and the other a fullerene component (PC71 BM). Ternary blended film based on PTB7-Th:N2200:PC71 BM at a composition of 2:0.5:2.5 (w/w/w) exhibited a best PCE of 6.2%, and reached 7.7% after introducing 1% of 1, 8-diiodoctane (DIO). The ternary cell also exhibited good long-term thermal stability after annealing at 100 °C for 1000 h. Abstract: Solution-processed bulk heterojunction (BHJ) solar cells based on ternary blends have previously achieved high power conversion efficiencies (PCEs). In this study, we obtained a combination of good cell performance and high thermal stability for an inverted ternary organic solar cell based on a single polymer donor (PTB7-Th) and two acceptors: one a polymer (N2200) and the other a fullerene component (PC71 BM). The ternary blended film based on PTB7-Th:N2200:PC71 BM at a composition of 2:0.5:2.5 (w/w/w) featured suitable cascade energy levels, a broad comprehensive absorption region, and smooth interfaces; its corresponding device exhibited a best PCE of 6.2%, an open-circuit voltage of 0.82 V, and a short-circuit current density of 14.4 mA cm −2 . After introducing 1% of 1, 8-diiodoctane (DIO), the highest PCE reached 7.7%. Furthermore, this ternary cell exhibited good long-term thermal stability after annealing at 100 °C for 1000 h.