Xiaoying Xiong, Shuo Wan, Bin Hu, Yi Li, Yunlong Ma, Guanghao Lu, Huiting Fu, Qingdong Zheng
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引用次数: 0
Abstract
M-series molecules are one kind of promising acceptor-donor-acceptor (A-D-A)-type acceptors for constructing high-performance organic solar cells (OSCs). However, their power conversion efficiencies (PCEs) are lagging behind that of current state-of-the-art OSCs, limited by the relatively low fill factor (FF) and photocurrent. Herein, combined strategies of layer-by-layer (LBL) deposition and interface engineering are conducted to systematically improve light utilization and thus PCEs for M36-based OSCs. Through choosing a proper processing solvent, a PCE of 17.3% with an FF of 77.9% is achieved for the resulting LBL devices, much higher than those (15.9%/74.0%) from the blend-casting devices. The improvement is assigned to the favorable morphological evolution that facilitates carrier generation and transport as well as reduces charge recombination. More importantly, light-harvesting of the active layers can be enhanced upon employing a self-assembled monolayer of (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) instead of the widely used PEDOT:PSS as the hole-selecting layer, due to the decreased parasitic absorption of the former. Consequently, 2PACz-based LBL devices exhibit significantly increased photocurrent, affording a PCE up to 18.2%, which is the highest among the reported A-D-A-type acceptor-based OSCs. These results deliver important strategies to enhance the performance of OSCs and thus highlight the great potential of M-series acceptors for practical applications.
期刊介绍:
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.