The effect of thermal treatment on the optical properties of active layers based on D18:Y6
Abstract
This study presents the experimental findings aimed at enhancing the performance of polymer solar cells (PSCs). The optical and photovoltaic properties of the D18 donor polymer and the Y6 acceptor were systematically investigated. Detailed analyses were conducted on the absorption spectra, energy level alignment, and intermolecular interactions of the donor and acceptor materials. The experimental results demonstrated that the D18 polymer possesses superior light-harvesting capabilities and photovoltaic performance. When employed as a photoactive layer in combination with the Y6 acceptor, the PSCs achieved a notable power conversion efficiency (PCE) of 15.7%. Furthermore, it was revealed that solvent vapor annealing of the active layer significantly influences the overall device efficiency, suggesting its critical role in optimizing the morphological and electronic properties of PSCs.
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List of references
Nur-E-Alam M, Islam MS, Abedin T, Islam MA, Yap BK, Kiong TS, Das N, Rahman MR, Khandaker MU. Current Opinion in Colloid Interface Science. 2025;101895.
Xu W, Chang Y, Zhu X, Wei Z, Zhang X, Sun X, Lu K, Wei Z. Organic solar cells based on small molecule donor and polymer acceptor. Chin Chem Lett. 2022;33:123–132.
Liu Y, Li B, Ma C-Q, Huang F, Feng G, Chen Q, Luo Q. Recent progress in organic solar cells (Part I: material science). Sci China Chem. 2022;65:224–268.
Li H, Lu K, Wei Z. Polymer/small molecule/fullerene based ternary solar cells. Adv Energy Mater. 2017;7:1602540.
Tang CW. Two-layer organic photovoltaic cell. Appl Phys Lett. 1986;48:183–185.
Yu G, Gao F, Heeger AJ. Polymer photovoltaic cells: Enhanced efficiencies via a network of internal donor-acceptor heterojunctions. Science. 1995;270:1789–1791.
Gasparini N, Salleo A, McCulloch I, Baran D. The role of the third component in ternary organic solar cells. Nat Rev Mater. 2019;4:229–242.
Lin Y, Wang J, Zhang ZG, Bai H, Li Y, Zhu D, Zhan X. An electron acceptor challenging fullerenes for efficient polymer solar cells. Adv Mater. 2015;27:1170–1174.
Yuan J, Zhang Y, Zhou L, Peng H, Johnson PA. Single-junction organic solar cell with over 15% efficiency using electron-deficient core. Joule. 2019;3:1140–1151.
Jeong SY, Woo HY, Wu Q, Zhang X, Yuan G, Zhang F. Layered optimization strategy enables over 17.8% efficiency. Chem Eng J. 2022;442:136368.
Gao J, Wang J, An Q, Ma X, Hu Z, Xu F. Over 16.7% efficiency of ternary organic photovoltaics by employing extra PC71BM. Sci China Chem. 2020;63:83–91.
Jiang M, Zhi H-F, Zhang. Controlling morphology and voltage loss with ternary strategy triggers efficient all-small-molecule organic solar cells. ACS Energy Lett. 2023;8.
Ma X, Zeng A, Gao J, Hu Z, Xu C, Son JH, Jeong SY, Zhang C, Li M, Wang K. Approaching 18% efficiency of ternary organic photovoltaics with wide bandgap polymer donor and well compatible Y6:Y6-1O as acceptor. Nat Sci Rev. 2021;8:nwaa305.
Zhang S, Ma X, Niu L, Jeong SY, Woo HY, Zhou Z, Zhang F. 18.66% efficiency of polymer solar cells employing two nonfullerene acceptors with fluorine or chlorine substitution. Sol RRL. 2023;7:2200957.
Gao J, Ma X, Xu C, Wang X, Son JH, Jeong SY, Zhang Y, Zhang C, Wang K, Niu L. Over 17.7% efficiency ternary-blend organic solar cells with low energy-loss and good thickness-tolerance. Chem Eng J. 2022;428:129276.
Fan Q, Lin FR, Ma W, Jen AK-Y. Selenium-fused Y6 derivatives and their derived polymerized small molecule acceptors for efficient organic solar cells. Sci China Chem. 2022;66:615–619.
Wang X, Sun Q, Gao J, Ma X, Son JH, Jeong SY, Hu Z, Niu L, Woo HY, Zhang J. Ternary organic photovoltaic cells exhibiting 17.59% efficiency with two compatible Y6 derivations as acceptor. Sol RRL. 2021;5:2100007.
Li X, Luo S, Sun H, Sung HH-Y, Yu H, Liu T, Lu X. Medium band-gap non-fullerene acceptors based on a benzothiophene donor moiety enabling high-performance indoor organic photovoltaics. Energy Environ Sci. 2021;14:4555–4563.
Gao J, Yu N, Chen Z, Wei Y, Li C, Liu T, Gu X, Zhang J, Wei Z, Tang Z. Over 19.2% efficiency of organic solar cells enabled by precisely tuning the charge transfer state via donor alloy strategy. Adv Sci. 2022;9:2203606.
Li G, Zhu R, Yang Y. Polymer solar cells. Nat Photonics. 2012;6:153–161.
Pan YQ, Sun GY. Star-shaped non-fullerene small acceptors for organic solar cells. ChemSusChem. 2019;12:4570–4600.
Zhao CC, Wang JX, Zhao XY, Yang RQ, Tang JG. Recent advances, challenges and prospects in ternary organic solar cells. Nanoscale. 2021;13:2181–2208.
Armin A, Li W, Sandberg OJ, Xiao Z, Ding LM, Nelson J, Neher D, Vandewal K, Shoaee S, Wang T, et al. A history and perspective of non-fullerene electron acceptors for organic solar cells. Adv Energy Mater. 2021;11:2003570.
Wang G, Melkonyan FS, Facchetti A, Marks TJ. All-polymer solar cells: Recent progress, challenges, and prospects. Angew Chem Int Ed. 2019;58:4129–4142.
Xiong J, Jin K, Jiang Y, Qin J, Wang T, Liu J, Liu Q, Peng H, Li X, Sun A. Thiolactone copolymer donor gifts organic solar cells a 16.72% efficiency. Sci Bull. 2019;64:1573–1576.
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