期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 170, 期 -, 页码 27-32出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2017.05.020
关键词
Intermediate band solar cell; ZnTe:Cr; Pulsed laser deposition
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT, & Future Planning (MSIP) [NRF-2014R1A2A1A11053936]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry, & Energy (MOTIE) of Republic of Korea [20163030013380]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20163030013380] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We report on a high-performance intermediate band solar cell (IBSC) based on Cr-doped ZnTe (ZnTe:Cr) fabricated using a pulsed laser deposition (PLD) method. Chromium (Cr) was uniformly distributed in the ZnTe:Cr thin film with an atomic concentration of about 3.5%, and the ZnTe:Cr thin film showed p-type electrical conductivity. The ZnTe:Cr thin film had higher absorption coefficients than those of undoped ZnTe films in the photon energy range below band gap of ZnTe (2.2 eV). The enhanced absorption coefficients of the ZnTe:Cr thin film were attributed to the photoionization energy between Cr2+ and Cr+ (Cr2+ reversible arrow Cr+), which acted as the IB to absorb photons below the bandgap of ZnTe (2.2 eV). Illumination with an AM 1.5G solar spectrum on the ZnTe:Cr IBSC generated a large short circuit current of 21.18 mA/cm(2), an open circuit voltage of 0.48 V, and a fill factor of 0.58, yielding a power conversion efficiency (PCE) of 5.9%, the highest reported PCE in an IBSC based on impurity-doped ZnTe.
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