Preparation of Organic Photovoltaics Using the Sensitizing Effect of Quantum Dots

Abstract

Organic photovoltaic is one of the solar cell consists of fullerene derivative which is an n-type semiconductor and the conductive polymer as p-type semiconductor. In my research, silicon quantum dots was introduced to the active layer consisting of fullerene derivative (PCBM) and a conductive polymer (PCPDTBT), to prepare the hybrid photovoltaic. The prepared hybrid solar cell with Si quantum dots achieved better cell performance compared with controlled solar cell without quantum dots. The hybrid solar cell showed larger value of Incident photon-to-current conversion efficiencies and lower photoluminescence intensity. This indicated that domain size among phase separation in active layer was made smaller than the active layer of controlled solar cell, by introducing Si quantum dots. This change of aggregation structure by quantum dots was contributed to the improvement of cell characteristics.

Keywords:

• Si quantum dots
• hybrid solar cell
• PCPDTBT/PCBM
• domain size

Acknowledgments

We would like to express appreciation for provided Si quantum dots solution to Prof. Tomohiro Nozaki (Tokyo Institute of Technology), and we thank Prof. Shuzi Hayase (Kyushu Institute of technology) and Prof. Naotoshi Nakashima (Kyushu University) for the measurement of IPCE and photoluminescences.