期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 23, 页码 7362-7367出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b02959
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资金
- National Science Foundation [CHE-1763207]
- UNC Research Opportunities Initiative (ROI) through the Center of Hybrid Materials Enabled Electronic Technology
- Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES)
- National Science Foundation, National Nanotechnology Coordinated Infrastructure, NNCI [ECCS-1542015]
Two-dimensional coherent photocurrent spectroscopies directly probe the electronic states and processes that are relevant to the performance of a photovoltaic device. In this Letter, we apply two-pulse nonlinear photocurrent spectroscopy to a photovoltaic device based on layered perovskite quantum wells. The method effectively decomposes the photovoltaic response into contributions from separate quantum wells and excited-state species (i.e., either single excitons or biexcitons). Our experiments show that the efficiency of photocurrent generation increases with the size of the quantum well. Overall, the results suggest that energy funneling processes in layered perovskites, which are most prominent in transient absorption spectroscopies, are largely irrelevant to the function of a photovoltaic cell.
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