Journal
ACS ENERGY LETTERS
Volume 4, Issue 9, Pages 2277-2286Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b01459
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Funding
- Natural Science Foundation of Jiangsu Province of China [BK20170337]
- National Natural Science Foundation of China [51803144, 51761145013, 61674111]
- China Postdoctoral Science Foundation [2019M651942]
- 111 projects
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office
- Office of Science, Office of Basic Energy Sciences, of the DOE [DE-AC02-05CH11231]
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All-polymer organic solar cells offer exceptional stability. Unfortunately, the use of bulk heterojunction (BHJ) structure has the intrinsic challenge to control the side-chain entanglement and backbone orientation to achieve sophisticated phase separation in all-polymer blends. Here, we revealed that the P-i-N structure can outperform the BHJ ones with a nearly 50% efficiency improvement, reaching a power conversion efficiency approaching 10%. This P-i-N structure can also provide an enhanced internal electric field and remarkably stable morphology Sequential deposition under harsh thermal stress. We have further demonstrated generality of the P-i-N structure in several other all-polymer systems. Considering the adjustable polymer molecular weight and solubility, the P-i-N device structure can be more beneficial for all-polymer systems. With the design of more crystalline polymers, the antiquated P-i-N structure can further show its strength in all-polymer systems by simplified morphology control and improved carrier extraction, becoming a more favorite device structure than the dominant BHJ structure.
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