Solution-Processed Interlayer of n-type Small Molecules for Organic Photovoltaic Devices: Enhancement of the Fill Factor due to Ordered Orientation

Sangkug Lee^a, Kyung Ho Choi^a, Gyo Jic Shin^a, Ho Jun Song^a, Doo Kyung Moon^b

^aKorea Institute of Industrial Technology, 89 Yangdaegiro-gil, Ipjang-myeon, Seobuk-gu, Cheonan-si, Chungcheongnam-do, 331, Korea, Republic of

^bKonkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Ho Jun Song, 027
Publication date: 5th February 2015

OPVs have drawn significant attention for these applications due to the global technology trends toward economic feasibility and continuous development coupled with efforts to preserve the environment. To improve the charge transport between the interfaces, a number of investigations to study the effects of introducing an interlayer have been reported recently. In particular, most research efforts have focused on the use of alcohol/water-soluble conjugated polymer electrolytes (CPEs) for the interlayer. In this study, we synthesized alcohol/water-soluble small molecules with various p- and n-type backbones. We introduced various p- and n- type molecules into the backbone to achieve effective charge transfer between the interfaces and ordered orientation. The synthesized molecules were dissolved in organic solvents and highly polar solvents. According to XRD measurements, a prominent diffraction peak at 20.1 ° was observed in the in-plane diffraction pattern of DPPA, which indicates an out-of-plane peak (010) due to the molecular packing by π-π stacking. A photovoltaic device containing DPPA exhibited an open-circuit voltage of 0.75 V, a current density of 15.1 mA/cm2, a fill factor of 69.0% and a power conversion efficiency of 7.9%.
a) J-V characteristics b) EQE spectra of the BHJ solar cells with the device (Conventional device structure: ITO/PEDOT:PSS/ PTB7:PC71BM(1:1.5)/without or with interlayer/Al.)
(1) Kesters, J.; Ghoos, T.; Penxten, H.; Drijkoningen, J.; Vangerven, T.; Lyons, D. M.; Verreet, B.; Aernouts, T.; Lutsen, L.; Vanderzande, D.; Manca, J.; Maes, W. Imidazolium-Substituted Polythiophenes as Efficient Electron Transport Materials Improving Photovoltaic Performance. Adv. Energy Mater. 2013, 3, 1180-1185. (2) He, Z.; Zhong, C.; Huang, X.; Wong, W.-Y.; Wu, H.; Chen, L.; Su, S.; Cao, Y. Simultaneous Enhancement of Open-Circuit Voltage, Short-Circuit Current Density, and Fill Factor in Polymer Solar Cells. Adv. Mater. 2011, 23, 4636-4643. (3) He, Z.; Zhong, C.; Su, S.; Xu, M.; Wu, H.; Cao, Y. Enhanced Power-Conversion Efficiency in Polymer Solar Cells Using an Inverted Device Structure. Nat. Photonics 2012, 6, 591-595.

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