Seminar Nasional: Kecenderungan Baru Fisika dan Kependidikannya, 2008, Malang, Indonesia

A Study on Internal Parameters Based on Reverse Bias Characteristic of Organic Photovoltaic Devices and Their Dependency on Intensity of Illumination

Kuwat Triyana1*, Timothy Siahaan2¨, Sholihun3+, Yuyun Irmawati1, Herlina Pratiwi1, Kamsul Abraha1

1Laboratory of Material Physics and Electronics
2 Research Group on Theoretical and Mathematical Physics
3Research Group on Computational Physics

Physics Department, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, BLS 21, Yogyakarta 55281, Indonesia

E-mail: *triyana@ugm.ac.id, ¨timmy_fisika_ugm_99@yahoo.co.id, +lion_avs@yahoo.com

Abstract. Information about internal parameters of organic photovoltaic devices is needed as a guideline in further fabrication of such devices with good performance. In this paper we investigate the current density-voltage characteristic of copper phthalocyanine (CuPc)/3,4,9,10-perylenetetracarboxylic (PTCBI) thin film heterojunction photovoltaic device in seeking such information. It is assumed that the device can be described by the standard one-diode equivalent circuit which is usually used to model inorganic photovoltaic devices. In order to find five parameters included in the model, we use the formula for open circuit voltage and short circuit current and two additional equations from the reverse bias characteristic of the device which is studied. The parameters of the device are found to depend on the illumination intensity. We calculate the parameter's value for each intensity. The result will be used for further study on the device especially as a comparison for the microscopic modeling for the same device.

Keywords: heterojunction, organic photovoltaic device, internal parameters, one diode equivalent circuit model