Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Semiconducting polymers have been used in a diverse range of applications, such as in organic light emitting diodes (OLEDs), organic photovoltaic cells (OPVs) and organic thin film transistors (OTFTs) for several decades. 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 novel alcohol/water-soluble discotic type small molecules (PBPA). The discotic derivatives exhibit unique material properties, such as high one-dimensional (1D) charge-carrier mobilities and anisotropic mechanical and optical properties.
PBPA exhibited higher solubility in highly polar solvents compared with PFN. PBPA experienced a 5 % weight loss at a temperature of 358 C, indicating high thermal stability due to the rigid pyrene structure. According to an XRD measurement, in the out-of-plane diffraction pattern of PBPA, a prominent diffraction peak was observed at 18.7°, which indicates an out-of-plane peak (010) due to the formation of an ordered columnar structure by π-π stacking. The π-π stacking distance of PBPA was 0.48 nm (λ = 2dsinθ). According to an XRD result, a large fraction of the PBPA derivatives are oriented face-on relative to the substrate due to the discotic structure. The OPV device using PBPA exhibited improved characteristics compared with the devices using PFN (FF 65.1 % vs. 60.7 %, PCE 7.0 % vs. 6.6 %) due to the reduction of the interfacial resistance. For inverted device with PBPA, the VOC, JSC, FF and PCE were 0.73 V, 17.7 mA/cm2, 63.6 % and 8.3 %, respectively, which represent improved results than PFN device.
Figure 1. a) J-V characteristics b) EQE spectra of the BHJ solar cells with the device (a Conventional device structure: ITO/PEDOT:PSS/ PTB7:PC71BM(1:1.5)/without or with interlayer/Al. b Inverted device structure: ITO/ZnO/ without or with interlayer /PTB7:PC71BM(1:1.5) /MoO3/Ag.)
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(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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