摘要
通过激子增殖来提高太阳能电池的光-电转换效率是近年来颇受重视的一个研究方向.本文对激子增殖产生的途径与机制,以及在其形成过程中应注意的各种因素作了扼要的介绍和讨论,诸如:冲击离子化过程、声子瓶颈现象、热-电子的冷却过程、Auger重合过程,以及热-电子的电子转移过程等,同时也对检测这一过程的重要方法——瞬态(泵浦-探测)吸收光谱(TA)作了简要介绍,并通过某些实例对这一现象在作为第三代太阳能电池中光-电转换材料的半导体量子点内情况作了说明.
Recently, the pathway and the mechanism of exciton multification for improving the photo-electric conversion efficiency of solar cell become an important aspect with extensive attention. In this review, many factors such as the impact ionization, phonon bottleneck, cooling of hot-electron, electron transfer process and the Auger recombination, which may affect the formation of the second electron-hole pair in system have been discussed. Review is also briefly to introduce the method of （Pump-Probe） transient absorption spectrum （TA） measurement for studying the dynamic process of exciton multification. And several examples are listed for the illustration of this phenomenon in semi-conductor QD systems which have been applied as a new materials in the third generation of solar cell.
出处
《影像科学与光化学》
CAS
CSCD
北大核心
2013年第3期161-174,共14页
Imaging Science and Photochemistry
