[21p-432-1~15] 12.5 Organic solar cells

▲ [21p-432-4] Enhancement of OPV efficiency via surface plasmon resonance excitation in NIR region

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

Keywords:surface plasmon resonance, plasmonic solar cell, organic solar cell

Studies of organic photovoltaics (OPVs) have been in the field of interest of scientists for more than a decade. Although, the OPVs provide various advantages (i.e., lightweight, flexibility, and low-cost) that do not exist in conventional Si solar cells, the short diffusion range of carriers inside active layer is still the issue that limits the thickness of the active layer to be a few hundred nanometers. This cause low light absorption. We have studied plasmonic nanoobjects, including nanoparticles and nanostructures to provide additional enhancement on photocurrent and efficiency which originated by the plasmonic excitation on the OPV devices. In this work, we demonstrate the utilization of plasmonic nanostructures to improve the efficiency of OPVs (PTB7:PC71BM). Figure 1 shows a schematic of the fabricated OPV device. The additional light absorption induced by surface plasmon excitation in NIR region delivers the enhancement of photocurrent and efficiency for 22.6% and 32.2%, respectively. In addition, the matching of plasmonic excitation and absorption of active layers could be a key to achieve more plasmonic enhancement effect.