Optical Manipulation of Incident Light for Enhanced Photon Absorption in Ultrathin Organic Photovoltaics
Seungyeon Han,
Hyunsung Jung,
Hyeon Jin Jung,
Bu Kyeong Hwang,
In Pyo Park,
Su Zi Kim,
Dea-Hee Yun,
Seog-Young Yoon,
Soo Won Heo
Affiliations
Seungyeon Han
Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
Hyunsung Jung
Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
Hyeon Jin Jung
Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
Bu Kyeong Hwang
Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
In Pyo Park
Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
Su Zi Kim
Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
Dea-Hee Yun
Resetcompany Co., Ltd., Dallaenae-ro, Sujeong-gu, Seongnam-si 13449, Gyeonggi-do, Korea
Seog-Young Yoon
Department of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
Soo Won Heo
Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
We attempted to improve the photon absorption of the photoactive layer in organic photovoltaic (OPV) devices by device engineering without changing their thickness. Soft nanoimprinting lithography was used to introduce a 1D grating pattern into the photoactive layer. The increase in photocurrent caused by the propagating surface plasmon–polariton mode was quantitatively analyzed by measuring the external quantum efficiency in transverse magnetic and transverse electric modes. In addition, the introduction of an ultrathin substrate with a refractive index of 1.34 improved photon absorption by overcoming the mismatched optical impedance at the air/substrate interface. As a result, the power conversion efficiency (PCE) of an ultrathin OPV with a 400 nm grating period was 8.34%, which was 11.6% higher than that of an unpatterned ultrathin OPV, and the PCE was 3.2 times higher at a low incident light angle of 80°, indicating very low incident light angle dependence.
