Abstract
It is widely recognized that fullerene derivatives show several advantages as n-type materials in photovoltaic applications. However, conventional [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) exhibits weak absorption in the visible region, and poor morphological stability, due to the facile aggregation. For further improvement of the device performance and durability, utilization of n-type polymeric materials instead of PCBM is considered to be a good way to solve the problems. In this study, we fabricated completely polymer-based solar cells utilizing p- and n-type block copolymers consisting of poly(3-hexylthiophene) (P3HT) and poly{[N,N′-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} [P(NDI2OD-T2)], respectively, containing common polystyrene (PSt) inert blocks, which decreased the size of phase separated structures. Electron mobility in synthesized P(NDI2OD-T2)-b-PSt film enhanced by a factor of 8 compared with homopolymer. The root mean square roughness of the blend film of two block copolymers (12.2 nm) was decreased, compared with that of the simple homopolymers blend (18.8 nm). From the current density-voltage characteristics, it was confirmed that the introduction of PSt into both P3HT and P(NDI2OD-T2) improves short-circuit current density (1.16 to 1.73 mA cm−2) and power-conversion efficiency (0.24% to 0.32%). Better performance is probably due to the uniformity of the phase separation, and the enhancement of charge mobility.
Highlights
Organic photovoltaics (OPVs) have attracted much attention as a new clean energy source, since the devices possess light, and flexible natures, and they can be fabricated at low-cost in large areas suitable for mass-production [1]
OPV performance was evaluated for the devices based on the blends P3HT/P(NDI2OD-T2), P3HT-bOPV performance was evaluated for the devices based on the blends P3HT/P(NDI2OD-T2), P3HT-bPSt/P(NDI2OD-T2)-b-PSt, P3HT/P(NDI2OD-T2)-b-PSt, and P3HT-b-PSt/P(NDI2OD-T2) from J-V
Characteristics, it was confirmed that the introduction of PSt into both P3HT and P(NDI2OD-T2)
Summary
Organic photovoltaics (OPVs) have attracted much attention as a new clean energy source, since the devices possess light, and flexible natures, and they can be fabricated at low-cost in large areas suitable for mass-production [1]. Most OPVs studied so far have utilized low molecular weight fullerene derivatives as n-type materials [4,5]. Since fullerene derivatives have several disadvantages such as high cost, low light absorption in the visible region, and low compatibility, studies on all-polymer solar cells utilizing polymeric acceptors, rather than low molecular weight fullerene derivatives, have been advanced in recent years [6,7,8,9,10,11,12,13,14,15]. In the case of non-fullerene polymeric alternatives, molecular versatility makes it possible to design suitable n-type polymeric semiconductors that exhibit high light absorption in the visible region in order to harvest
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