High Mobility Hole Extraction Material for Organic Solar Cell Application

Abstract

We report a high mobility hole extraction material, N,N,N′,N′,-tetrakis(biphenyl-4-yl)benzidine (TBBD) for organic solar cell applications. Its highest occupied molecular orbital energy value at 5.3 eV is well matched with a donor layer and its high mobility of 1.74 × 10⁻² cm²/Vs brings out an easy and rapid extraction of holes from the donor material. The TBBD incorporated device showed significant improvement of open-circuit voltage, resulting in power conversion efficiency improvement of 9% compared with reference device.

Keywords:

• Organic solar cells
• Hole extraction layer
• Power conversion efficiency
• Mobility
• Built-in potential

Acknowledgment

This work was supported by the Kyung Hee University, Seoul, South Korea (Research Grant No. 20111287).