Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 4, Issue 1, Pages 196-201Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2013.2282738
Keywords
Highly mismatched alloy (HMA); intermediate band solar cell (IBSC); molecular beam epitaxy (MBE); two-step photon excitation (TPE); ZnTeO
Funding
- JST PRESTO program
- JSPS KAKENHI [24760258]
- Nippon Sheet Glass Foundation for Materials Science and Engineering
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Grants-in-Aid for Scientific Research [25420291, 24760258] Funding Source: KAKEN
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We present the results of systematic experimental studies on ZnTeO intermediate band solar cells (IBSCs) with a n-ZnO window layer. In order to understand photovoltaic (PV) activities of ZnTeO IBSCs, we first describe PV properties of ZnO/ZnTe solar cells without the intermediate band (IB). The improved efficiency of 1.38% is demonstrated by using a n(+) -ZnO/i-ZnO/i-ZnTe/p-ZnTe structure. Then, the PV properties of ZnTeO IBSCs fabricated using n-ZnO window layer with and without a blocking barrier for IB are compared. The device with a blocked IB shows higher open-circuit voltage than that without the blocking barrier. High external quantum efficiency (EQE) is observed in the photon energy range in which electron transitions from the valence band to the IB take place in ZnTeO IBSC without the blocking layer, whereas the device with the blocked IB shows a small EQE at the same energy range, implying the electron accumulation in IB. Finally, the production of photogenerated current by two-step photon excitation via IB is demonstrated.
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