Plasmonic Periodic Nanodot Arrays via Laser Interference Lithography for Organic Photovoltaic Cells with >10% Efficiency.
In this study, we demonstrate a viable and promising optical engineering technique enabling the development of high-performance plasmonic organic photovoltaic devices. Laser interference lithography was explored to fabricate metal nanodot (MND) arrays with elaborately controlled dot size as well as periodicity, allowing spectral overlap between the absorption range of the active layers and the surface plasmon band of MND arrays. MND arrays with ∼91 nm dot size and ∼202 nm periodicity embedded in a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) hole transport layer remarkably enhanced the average power conversion efficiency (PCE) from 7.52% up to 10.11%, representing one of the highest PCE and degree of enhancement (∼34.4%) levels compared to the pristine device among plasmonic organic photovoltaics reported to date. The plasmonic enhancement mechanism was investigated by both optical and electrical analyses using finite difference time domain simulation and conductive atomic force microscopy studies.
Yulin
Y
Oh
Department of Chemistry and Nano Science, College of Natural Sciences, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea.
Ju Won
JW
Lim
Jae Geun
JG
Kim
Department of Chemistry and Nano Science, College of Natural Sciences, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea.
Huan
H
Wang
Byung-Hyun
BH
Kang
Young Wook
YW
Park
Department of Chemistry and Nano Science, College of Natural Sciences, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea.
Heejun
H
Kim
Department of Chemistry and Nano Science, College of Natural Sciences, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea.
Yu Jin
YJ
Jang
Department of Chemistry and Nano Science, College of Natural Sciences, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea.
Jihyeon
J
Kim
Department of Chemistry and Nano Science, College of Natural Sciences, Ewha Womans University , 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea.
Dong Ha
DH
Kim
Byeong-Kwon
BK
Ju
laser interference lithography; metal nanodot array; organic photovoltaics; surface plasmon