TY - JOUR
T1 - Dimethyl-2H-benzimidazole based small molecules as donor materials for organic photovoltaics
AU - Song, Suhee
AU - Han, Hyojung
AU - Kim, Yonghee
AU - Lee, Byoung Hoon
AU - Park, Sung Heum
AU - Jin, Youngeup
AU - Kim, Il
AU - Lee, Kwanghee
AU - Suh, Hongsuk
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) ( 2010-0015069 ).
PY - 2011/7
Y1 - 2011/7
N2 - Utilization of 2,2-dimethyl-2H-benzimidazole has received strong attention as the electron-deficient unit for the generation of electron donor material for organic photovoltaic cells (OPVs). This paper reports the first small organic molecules based on dimethyl-2H-benzimidazole, which can produce intramolecular charge transfer. Two soluble small organic molecules, MMM and OMO, with dimethyl-2H-benzimidazole unit were synthesized by Suzuki coupling reaction with Pd(0)-catalyst. The spectra of MMM and OMO in the solid thin films show absorption bands with maximum peaks at 374, 598 and 373, 588 nm, and the absorption onsets at 678 and 673 nm, corresponding to band gaps of 1.83 and 1.84 eV, respectively. The devices comprising MMM with PC61BM (1:3) showed a V OC of 0.66 V, a JSC of 2.03 mA/cm2, and a fill factor (FF) of 0.27, giving a power-conversion efficiency of 0.37%.
AB - Utilization of 2,2-dimethyl-2H-benzimidazole has received strong attention as the electron-deficient unit for the generation of electron donor material for organic photovoltaic cells (OPVs). This paper reports the first small organic molecules based on dimethyl-2H-benzimidazole, which can produce intramolecular charge transfer. Two soluble small organic molecules, MMM and OMO, with dimethyl-2H-benzimidazole unit were synthesized by Suzuki coupling reaction with Pd(0)-catalyst. The spectra of MMM and OMO in the solid thin films show absorption bands with maximum peaks at 374, 598 and 373, 588 nm, and the absorption onsets at 678 and 673 nm, corresponding to band gaps of 1.83 and 1.84 eV, respectively. The devices comprising MMM with PC61BM (1:3) showed a V OC of 0.66 V, a JSC of 2.03 mA/cm2, and a fill factor (FF) of 0.27, giving a power-conversion efficiency of 0.37%.
KW - 2H-benzimidazole
KW - Photovoltaic cells
KW - Small molecular
UR - http://www.scopus.com/inward/record.url?scp=79955477151&partnerID=8YFLogxK
U2 - 10.1016/j.solmat.2011.02.005
DO - 10.1016/j.solmat.2011.02.005
M3 - Article
AN - SCOPUS:79955477151
SN - 0927-0248
VL - 95
SP - 1838
EP - 1845
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
IS - 7
ER -
