High-efficiency organic solar cells processed from a halogen-free solvent systemShow others and affiliations
2023 (English)In: Science in China Series B: Chemistry, ISSN 1674-7291, E-ISSN 1869-1870, Vol. 66, no 8, p. 2380-2388Article in journal (Refereed) Published
Abstract [en]
The use of non-halogenated solvents for the green manufacture of high-efficiency organic solar cells (OSCs) is important for their future application. However, the power conversion efficiency (PCE) of the non-halogenated solvent processed OSCs is generally lower than their halogenated counterpart due to the poor film microstructure caused by the solubility issue. Herein, we propose a halogen-free solvent system to optimize film microstructure of the photovoltaic blend based on the polymer donor D18 and small-molecule acceptor (SMA) L8-BO towards high-efficiency OSCs. The solvent system is consisted of a main solvent carbon disulfide and an additive paraxylene, where the former ensures the good solution-processability and promotes the solution aggregation of L8-BO, and the latter can finely control the phase-separation process by selectively dissolving the SMA. This solvent combination robustly produces a high-quality active layer, i.e., the bicontinuous networks of donor and acceptor with nano-sized phase-separation and strong & pi;-& pi; stacking. With the effective charge generation, transport and collection, the resulting device from the non-halogenated solvent system shows a high PCE of 17.50%, which is comparable to that of the device prepared from the halogenated solvent chloroform (ca. 17.11%). This article proposes a new strategy for the green fabrication of high-efficiency OSCs to accelerate their industrialization.
Place, publisher, year, edition, pages
SCIENCE PRESS , 2023. Vol. 66, no 8, p. 2380-2388
Keywords [en]
organic solar cells; small molecule acceptor; film microstructure; non-halogenated solvent; solvent engineering
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:liu:diva-196772DOI: 10.1007/s11426-023-1608-6ISI: 001020104300002OAI: oai:DiVA.org:liu-196772DiVA, id: diva2:1790550
Note
Funding Agencies|National Natural Science Foundation of China [51873204, 51933010, 51773046]; 111 Project [B21005]; National 1000-Talent-Plan Program [1110010341]; Science and Technology Program of Shaanxi Province [2021KJXX-13]; Fundamental Research Funds for the Central Universities [GK202103104]; Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-AC02-05CH11231]
2023-08-232023-08-232024-04-02Bibliographically approved