| 초록 |
A new TPD-based small molecule with a D-A-D-A-D backbone consisting of electron donating bithiophene and electron accepting TPD units was synthesized. It has a low bandgap with thermal, optical, and electrochemical properties using thieno [3,4-c] pyrrole-4,6-dione (TPD) derivatives and applied to bulk heterojunction organic solar cells. The solar cells were fabricated by blending the TPD based small molecule (M1) and [6, 6]-phenyl C71 butyric acid methyl ester (PC71BM), and the morphologies of the BHJ layers were controlled via processing additives with 1,8-diiodooctane (DIO) and 1-chloronaphthalene (CN), respectively. Thus, the use of processing additives continuously suppressed molecular cohesion and exhibited proper phase separation, which resulted in increased the power conversion efficiency from 0.36% to 1.86% |
