Carrier extraction from GaSb quantum rings in GaAs solar cells using direct laser excitation

Carrier extraction from GaSb quantum rings in GaAs solar cells using direct laser excitation
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使用直接激光激发从 GaAs 太阳能电池中的 GaSb 量子环中提取载流子

DOI:
10.1049/iet-opt.2013.0062
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发表时间:
2014
影响因子:
1.6
通讯作者:
James J
James J
中科院分区:
计算机科学4区
文献类型:
--
作者:
James J

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作者报告了嵌入GaAs单结太阳能电池有源区的II型GaSb量子环(QR)的空穴逃逸机制分析。当使用激发能量低于GaAs基质带隙的1064 nm红外激光激发太阳能电池时,直接在GaSb QR内产生光生电子-空穴对。QR光电流表现出线性依赖于几十年的激发强度。热激活能被发现是弱依赖于入射光的水平,并增加了几个毫电子伏以上的几个订单的激发强度。当使用1064 nm的激光,入射功率密度为2.6 W cm-2,直接探测时,作者的QR中的相对吸收量为每层1.4 × 10 - 4。计算出空穴的热逃逸速率为1011 ~ 1012 s −1,比辐射复合速率109 s −1快得多。这种行为是有前途的聚光太阳能电池的发展,并有可能提高太阳能电池的效率下,一个强大的太阳能集中。
The authors report on the analysis of the hole escape mechanisms from type‐II GaSb quantum rings (QRs) embedded within the active region of a GaAs single junction solar cell. When the solar cell is excited by using a 1064 nm infrared laser with excitation energy lower than the bandgap of the GaAs matrix, photogenerated electron–hole pairs are created directly within the GaSb QRs. The QR photocurrent exhibits a linear dependence on the excitation intensity over several decades. The thermal activation energy was found to be weakly dependent on the incident light level and increased by only a few meV over several orders of excitation intensity. The magnitude of the relative absorption in the author's QRs when directly probed by using a 1064 nm laser with an incident power density of ∼ 2.6 W cm−2is found to be ∼ 1.4 × 10−4per layer. The thermal escape rate of the holes was calculated and found to be ∼ 1011to 1012s−1, which is much faster than the radiative recombination rate 109s−1. This behaviour is promising for concentrator solar cell development and has the potential to increase solar cell efficiency under a strong solar concentration.
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