[18p-P4-1~48] 12.5 Organic solar cells

▲ [18p-P4-29] Enhancement of OPV Efficiency in NIR Region by Grating-coupled Surface Plasmon

〇(P)Supeera Nootchanat¹, Apichat Pangdam², Ryousuke Ishikawa¹, Kanet Wongravee³, Chutiparn Lertvachirapaiboon¹, Kazunari Shinbo¹, Keizo Kato¹, Sanong Ekgasit³, Akira Baba¹ (1.Niigata Univ., 2.Prince of Songkla Univ., 3.Chulalongkorn Univ.)

Keywords:organic solar cells, near-Infrared, plasmonic

Studies of organic photovoltaics (OPVs) have gained more attentions from scientists since last decade. This is due to the various advantages (i.e., lightweight, flexible, and inexpensive) that do not exist in conventional Si solar cells. Studies have mostly focused on optimization of fabrication protocols and enhancement of the OPV performance. Employing plasmonic nanoobjects, including nanoparticles and nanostructures, have provided the additional enhancement on photocurrent and efficiency which was originated by the plasmonic excitation on the OPV devices. In addition, the plasmonic excitation induced by metallic grating occurred in NIR region. Employing the appropriate active layers could be a key to achieve more plasmonic enhancement effect. The results show that, when PTB7:PC₇₁BM was employed as an active layer, the enhancement of photocurrent and efficiency were 22.6% and 32.2%, respectively. Meanwhile, those of P3HT:PC₆₁BM showed the enhancement of photocurrent and efficiency for 11.05% and 19.28%, respectively. This is due to the absorption of PTB7:PC₇₁BM matches to the plasmonic excitation peaks of metallic grating.