Study the Effect of Ruthenium Dye Layer on Negative Capacitance in Solar Cells Based on the Nc-TiO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; Semiconducting Polymer Heterojunction

H Al-Dmour

doi:10.4236/msa.2015.61012

Abstract

We report the effect of ruthenium dye on negative capacitance of nanocrystalline titanium dioxide/poly(3-hexyl thiophene), nc-TiO2/P3HT, heterojunction solar cells. It has been found that the low frequency capacitance reaches a high positive value and then drop to the negative region. In P3HT/Ru-Dye/nc-TiO2 solar cells, the negative capacitance is observed under very low forward bias condition unlike the negative capacitance in P3HT/ncTiO2 solar cells. That is attributed to the difference of the concentration of dipole and presence of depletion region at interface between the P3HT and nc-TiO2.

Highlights

The capacitance measurements have been conducted on organic/inorganic solar cells to understand the properties of materials and interfaces [1]-[5]
According to Lungenshmeid’s work [5], the organic solar cells based on P3HT and PCBM materials produce large negative capacitance
Under negative bias condition, the C and (G ω ) curves are affected by the voltage applied on SnO2 electrode

Summary

Introduction

The capacitance measurements have been conducted on organic/inorganic solar cells to understand the properties of materials and interfaces [1]-[5]. The negative capacitance phenomenon in organic/inorganic electronic devices has been observed and gains a lot of interests. One example of such devices is organic light emitting diode. According to Lungenshmeid’s work [5], the organic solar cells based on P3HT and PCBM materials produce large negative capacitance. They have found that the appearance of negative capacitance in this device is associated with slow electron hole bimolecular recombina-

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