title: Dithienobenzodithiophene-Based Small Molecule Organic Solar Cells with over 7% Efficiency via Additive- and Thermal-Annealing-Free Processing.
abstract: Here we introduce a novel small molecule based on dithienobenzodithiophene and rhodanine, DTBDT-Rho, developed to study the effect of the rhodanine substitutuent on small molecule bulk heterojunction (BHJ) solar cells. DTBDT-Rho possesses distinct crystalline characteristics, sufficient solubility in chlorinated solvents, and broad absorption properties. Therefore, solution-processed BHJ photovoltaic cells made with DTBDT-Rho:PC71BM blends showed an extremely high power conversion efficiency (PCE; 7.10%); notably, this PCE value was obtained without the use of additives or thermal treatments. To our knowledge, the PCE over 7% is a significantly powerful value among rhodanine-based small molecule BHJ solar cells without additives or thermal treatments.
authors.forename: Hyeng Gun
authors.initials: HG
authors.lastname: Song
authors.affiliation: POSTECH Organic Electronics Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Republic of Korea.
authors.forename: Yu Jin
authors.initials: YJ
authors.lastname: Kim
authors.forename: Ji Sang
authors.initials: JS
authors.lastname: Lee
authors.forename: Yun-Hi
authors.identifier: http://orcid.org/0000-0001-8856-4414
authors.initials: YH
authors.lastname: Kim
authors.affiliation: POSTECH Organic Electronics Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Republic of Korea.
authors.forename: Chan Eon
authors.initials: CE
authors.lastname: Park
authors.forename: Soon-Ki
authors.initials: SK
authors.lastname: Kwon
keywords: dithienobenzodithiophene; power conversion efficiency; rhodanine; small molecule solar cell; without additives or thermal treatments