Theory of open-circuit voltage and the driving force of charge separation in pn-junction solar cells

被引：21
|
作者：
Hara, Kosuke O. [1 ]
Usami, Noritaka [1 ]
机构：
[1] Nagoya Univ, Grad Sch Engn, Nagoya, Aichi 4648603, Japan
来源：
JOURNAL OF APPLIED PHYSICS | 2013年 / 114卷 / 15期
关键词：
D O I：
10.1063/1.4825046
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have derived the formula to calculate the open-circuit voltage in a pn-junction solar cell from carrier densities by considering the driving force of charge separation without using the equation for current. The excess amount of chemical potential of charge carriers is proposed as the origin of the driving force of charge separation, and the voltage formula is derived from the gradient of excess chemical potential. The calculated voltage is shown to agree with the result of a rigorous device simulation for symmetrical pn-homojunction devices with band gaps of 0.6-1.8 eV and majority-carrier densities of 10(15)-10(19) cm(-3). The developed formula is, therefore, valid for the pn-homojunction devices, indicating that the driving force of charge separation stems from the excess chemical potential. (C) 2013 AIP Publishing LLC.
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页数：4
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