Analytical model for the open-circuit voltage and its associated resistance in organic planar heterojunction solar cells

被引：192

作者：

Cheyns, D.

Poortmans, J.

Heremans, P.

Deibel, C. ^{[1
]}

Verlaak, S. ^{[1
]}

Rand, B. P. ^{[1
]}

Genoe, J. ^{[1
]}

机构：

[1] Katholieke Univ Leuven, ESAT, B-3001 Louvain, Belgium

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.77.165332

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We derive an analytical formula for the open-circuit voltage (V(oc)) of organic planar heterojunction solar cells under standard operating conditions. We find that the type of free carrier recombination at the interface between the donor and acceptor materials controls the slope of V(oc) vs incident light intensity. By using the same derivation, an equation for the resistance around V(oc) is obtained. From this, we investigate two parameters in more detail and compare them to experiments. The first is the work function of the cathode metal. We show that, within our model, V(oc) does not depend on this work function, while the cell resistance around V(oc) is strongly dependent on it. Second, we find that the asymptotic resistance around V(oc) is a third-order power function of the thickness of the organic layers (acceptor or donor). The model provides insights to achieve low-resistivity high open-circuit voltage organic solar cells.

引用

页数：10

共 41 条

[11] Organic co-evaporated films of a PPV-pentamer and C60:: model systems for donor/acceptor polymer blends [J].