Donor-acceptor small molecule with coplanar and rigid pi-bridge for efficient organic solar cells
Journal
Solar Energy Materials and Solar Cells
Journal Volume
109
Pages
33-39
Date Issued
2013
Author(s)
Chi, Liang-Chen
Chen, Hsiao-Fan
Hung, Wen-Yi
Hsu, Yu-Hsiang
Feng, Ping-Chi
Chou, Shu-Hua
Liu, Yi-Hung
Abstract
A novel donor-acceptor (D-A) donor molecule, 1, comprising of two di-p-tolylamino donors and a dicyanovinylene acceptor bridged by a planar and rigid fluorene moiety has been synthesized and characterized. The molecular structure and crystal packing of 1 was characterized by single-crystal X-ray crystallography. Such molecular configuration endowed 1 with an efficient D-A interaction, rendering an intense ICT absorption band for efficiently light-harvesting and retain low-lying HOMO for generating sufficient open-circuit voltage (Voc). The vacuum-deposited hybrid planar-mixed heterojunction (PMHJ) photovoltaic devices utilizing 1 as donor and C70 as acceptor to achieve power conversion efficiencies (PCEs) of 4.04 and 5.31% for the single- and tandem-cell photovoltaic devices under simulated AM 1.5 illumination (100 mW cm-2). © 2012 Elsevier B.V. All rights reserved.
SDGs
Other Subjects
Crystal packings; Dicyanovinylene; Donor molecules; Donor-acceptors; Fluorene moiety; Light-harvesting; Molecular configurations; Organic solar cell; Photovoltaic devices; Power conversion efficiencies; Single crystal X-ray crystallography; Small molecules; Conversion efficiency; Heterojunctions; Molecules; Open circuit voltage; Photovoltaic cells; X ray crystallography; Synthesis (chemical)
Type
journal article