Highly Efficient Organic Solar Cells with Improved Vertical Donor-Acceptor Compositional Gradient Via an Inverted Off-Center Spinning Method

Jiang Huang; Joshua H Carpenter; Chang-Zhi Li; Jun-Sheng Yu; Harald Ade; Alex K-Y Jen

doi:10.1002/adma.201504014

Highly Efficient Organic Solar Cells with Improved Vertical Donor-Acceptor Compositional Gradient Via an Inverted Off-Center Spinning Method

Adv Mater. 2016 Feb 3;28(5):967-74. doi: 10.1002/adma.201504014. Epub 2015 Dec 2.

Authors

Jiang Huang^{1

2}, Joshua H Carpenter³, Chang-Zhi Li^{1

4}, Jun-Sheng Yu², Harald Ade³, Alex K-Y Jen¹

Affiliations

¹ Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA.
² State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, P. R. China.
³ Department of Physics and Organic and Carbon Electronics Laboratory, North Carolina State University, Raleigh, NC, 27695-8202, USA.
⁴ Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.

PMID: 26628195
DOI: 10.1002/adma.201504014

Abstract

A novel, yet simple solution fabrication technique to address the trade-off between photocurrent and fill factor in thick bulk heterojunction organic solar cells is described. The inverted off-center spinning technique promotes a vertical gradient of the donor-acceptor phase-separated morphology, enabling devices with near 100% internal quantum efficiency and a high power conversion efficiency of 10.95%.

Keywords: bulk heterojunctions; off-center spin; organic solar cells; power conversion efficiency.