Production of photocurrent due to intermediate-to-conduction-band transitions:: A demonstration of a key operating principle of the intermediate-band solar cell
Production of photocurrent due to intermediate-to-conduction-band transitions:: A demonstration of a key operating principle of the intermediate-band solar cell
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DOI：
10.1103/physrevlett.97.247701
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发表时间：
2006-12-15
影响因子：
8.6
通讯作者：
Luque, A.
中科院分区：
文献类型：
--
作者：
Marti, A.;Antolin, E.;Luque, A.
我们介绍了利用量子点技术制造的中间带太阳能电池，首次显示了当两个亚带隙能量光子同时被吸收时产生的光电流。一个光子产生从中间带到导带的光学跃迁，而第二个光子将一个电子从价带泵送到中间带。对这种双光子吸收过程的检测对于验证中间波段太阳能电池的工作原理至关重要。这一现象是最终允许太阳能电池通过低于带隙的光子吸收产生光电流，而不会降低其输出电压的基石物理原理。
We present intermediate-band solar cells manufactured using quantum dot technology that show for the first time the production of photocurrent when two sub-band-gap energy photons are absorbed simultaneously. One photon produces an optical transition from the intermediate-band to the conduction band while the second pumps an electron from the valence band to the intermediate-band. The detection of this two-photon absorption process is essential to verify the principles of operation of the intermediate-band solar cell. The phenomenon is the cornerstone physical principle that ultimately allows the production of photocurrent in a solar cell by below band gap photon absorption, without degradation of its output voltage.