Slowing of carrier cooling in hot carrier solar cells

被引：136

作者：

Conibeer, G. J. ^{[1
]}

Konig, D. ^{[1
]}

Green, M. A. ^{[1
]}

Guillemoles, J. F. ^{[1
]}

机构：

[1] Univ New S Wales, ARC Photovolta Ctr Excellence, Sydney, NSW 2052, Australia

来源：

THIN SOLID FILMS | 2008年 / 516卷 / 20期

关键词：

hot carriers; carrier cooling; phonon bottleneck;

D O I：

10.1016/j.tsf.2007.12.102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The concept of the hot carrier cell is to absorb a wide range of photon energies and, before the resultant "hot" carriers can thermalise with the lattice, separate and collect them in the external circuit. Carrier thermalisation typically occurs in a few picoseconds, hence a significant slowing of carrier cooling is required. This has only been observed at very high illumination intensities via a "phonon bottleneck" effect. The critical factor is the decay rate of these optical phonons into acoustic phonons, which occurs primarily via the Klemens mechanism. This paper discusses interruption of this mechanism in the wide "phononic band gap" of some binary compounds and modelling of a possible replication of this in quantum dot superlattices in which there is a modulation of the acoustic impedance. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：6948 / 6953

页数：6

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