期刊
PHYSICAL REVIEW B
卷 83, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.195326
关键词
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资金
- Department of Energy, Office of Basic Energy Sciences, Energy Frontier Research Centers: The Center for Solar and Thermal Energy Conversion at the University of Michigan [DE-SC0000957]
- Argonne-Northwestern Solar Energy Research (ANSER) Center [DE-SC0001059]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Air Force Office of Scientific Research
- Ministry of Knowledge and Economy of Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [2009-선진-B-015] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Excitonic solar cells, comprised of materials such as organic semiconductors, inorganic colloidal quantum dots, and carbon nanotubes, are fundamentally different than crystalline, inorganic solar cells in that photogeneration of free charge occurs through intermediate, bound exciton states. Here, we show that the Second Law of Thermodynamics limits the maximum efficiency of excitonic solar cells below the maximum of 31% established by Shockley and Queisser [J. Appl. Phys. 32, 510 (1961)] for inorganic solar cells (whose exciton-binding energy is small). In the case of ideal heterojunction excitonic cells, the free energy for charge transfer at the interface, Delta G, places an additional constraint on the limiting efficiency due to a fundamental increase in the recombination rate, with typical -Delta G in the range 0.3 to 0.5 eV decreasing the maximum efficiency to 27% and 22%, respectively.
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