Solar cell as a heat engine: energy-entropy analysis of photovoltaic conversion
Solar cell as a heat engine: energy-entropy analysis of photovoltaic conversion
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DOI：
10.1002/pssa.200880460
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发表时间：
2008-12-01
影响因子：
2
通讯作者：
Markvart, Tom
中科院分区：
文献类型：
--
作者：
Markvart, Tom
本文以一种更直接、更简单的方法，发展了最近提出的量子太阳能转换器产生的电压或自由能的热力学理论。我们分别考虑入射辐射的单个光子的发光和转换。转换过程的能量/熵平衡产生了一个电压表达式，其形式与热机做功的经典热力学相似。光的吸收和发射的类似平衡给出了不可逆熵产生的表达式，其降低了太阳能电池产生的开路电压。由于个别机制，包括非辐射重组的损失的详细表达式，获得与使用的近似，其中在入射和发射光束中的光子建模为一个理想的二维气体。(C)2008 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆
A thermodynamic theory for the voltage or free energy generated by a quantum solar energy converter which has recently been proposed, is developed here in a more direct and simpler way. We consider separately the luminescene and conversion of a single photon of the incident radiation. The energy/entroypy balance for the conversion process yields an expression for the voltage in a form familiar from the classical thermodynamics of the work carried out by the heat engine. A similar balance for the absorption and emission of light gives an expression for the irreversible entropy generation which reduces the open circuit voltage generated by the solar cell. Detailed expressions for losses due to individual mechanisms, including non-radiative recombinations, are obtained with the use of an approximation where photons in the incident and emitted beams are modelled as an ideal two-dimensional gas. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim