Enhancement of the Fill Factor through an Increase of the Crystallinity in Fullerene-Based Small-Molecule Organic Photovoltaic Cells

Min-Soo Choi; Tae-Min Kim; Hyun-Sub Shim; Beom-Soo Kim; Hyo Jung Kim; Jang-Joo Kim

doi:10.1021/acsami.5b01166

Enhancement of the Fill Factor through an Increase of the Crystallinity in Fullerene-Based Small-Molecule Organic Photovoltaic Cells

ACS Appl Mater Interfaces. 2015 May 6;7(17):9134-8. doi: 10.1021/acsami.5b01166. Epub 2015 Apr 23.

Authors

Min-Soo Choi¹, Tae-Min Kim¹, Hyun-Sub Shim¹, Beom-Soo Kim¹, Hyo Jung Kim², Jang-Joo Kim¹

Affiliations

¹ †Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, South Korea.
² ‡Department of Organic Material Science and Engineering, College of Engineering, Pusan National University, Busan 609-735, South Korea.

PMID: 25875637
DOI: 10.1021/acsami.5b01166

Abstract

We report that the crystallinity of C70 is improved significantly if CuI is used as a templating layer, leading to remarkable enhancement of hole mobilities from 8.32 × 10(-6) to 3.26 × 10(-5) cm(2)/(V s). As a result, the use of the templating layer in C70-based solar cells with low donor concentration resulted in significant improvement of the fill factor from 0.51 to 0.57 and the power conversion efficiency from 5.56% to 6.23% under simulated AM 1.5G, 1 sun irradiation. This result demonstrates that the CuI templating layer is effective at improving the crystallinity of the fullerene derivatives as well as the donor materials.

Keywords: C70; copper iodide; low donor concentration; organic photovoltaic; templating layer.

Publication types

Research Support, Non-U.S. Gov't