Interband Cascade Photovoltaic Devices for Conversion of Mid-IR Radiation
Interband Cascade Photovoltaic Devices for Conversion of Mid-IR Radiation
复制标题
用于转换中红外辐射的带间级联光伏器件
DOI：
10.1109/jphotov.2013.2239360
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发表时间：
2013
影响因子：
3
通讯作者：
M. Johnson
中科院分区：
文献类型：
--
作者：
R. Hinkey;Zhao Tian;S. Rassel;R. Yang;J. Klem;M. Johnson
研究了带间级联结构在中红外光电转换中的应用。我们详细研究了七阶单带隙器件的性能特征和温度依赖性。这些级联结构器件能够在80 K时实现高达1.68 V的开路电压，截止波长为4.0 μm。总功率效率被分解成单个效率的乘积，以便确定转换过程中涉及的每个物理机制的功率损失。我们发现，在低温下，功率转换受到入射光吸收不完全和填充系数低于50%的限制。在较高的温度下，开路电压的下降限制了效率。我们评论这种效率分析的结果将如何引导我们未来努力改进设备的方向。
Interband cascade structures are investigated for applications in the photovoltaic conversion of mid-infrared radiation. We present detailed studies of the performance characteristics and the temperature dependence of seven-stage, single-bandgap devices. These cascade structure devices were able to achieve open-circuit voltages as high as 1.68 V with a cutoff wavelength of 4.0 μm at 80 K. The total power efficiency was broken down into a product of individual efficiencies in order to determine the power loss from each of the physical mechanisms that are involved in the conversion process. We find that at low temperature, the power conversion is limited by incomplete absorption of the incident light and a fill factor below 50%. At higher temperature, the drop in open-circuit voltage limits the efficiency. We comment on how the results of this efficiency analysis will steer the direction of our future efforts toward device improvement.