Poly[(9,9-dioctylfluorene)-2,7-diyl-alt-(4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole)-2',2''-diyl]:PCBM thin films: Molecular self-assembly, hexyl substituent groups and sheet resistance relationships
Poly[(9,9-dioctylfluorene)-2,7-diyl-alt-(4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole)-2',2''-diyl] (F8TBT) is a conjugated polymer with peculiar characteristics due to its D-A type architecture. F8TBT ambipolar feature has allowed the confection of F8TBT/PCBM ([6,6]-Phenyl-C 61 -butyric acid methyl ester) and polymer/F8TBT heterojunctions for solar cells. However, the use of PCBM as electron acceptor in photovoltaic devices is still sovereign because of its great electron affinity and compatibility with a large amount of conjugated polymers. The effects of PCBM content (0, 33, 50, 67, 75 and 80wt%) and amount of hexyl substituent groups in F8TBT polymer backbone on morphology and Hall sheet resistance (R s ) of F8TBT:PCBM thin films are evaluated quantitatively by optical microscopy and image processing. Circular-like cavities are formed on F8TBT films by molecular self-assembly, such structures on F8TBT film surface were identified by AFM. The statistical distributions of the self-assembled cavity diameters can be fitted by Lorentz, Boltzmann sigmoidal and Gauss statistics functions, depending on the amount of hexyl substituent groups and PCBM. The absence of these alkyl groups on the polymer chains causes the following effects: increasing of the R s value on 69% and modification of the cavity size distribution. Moreover, there is significant elevation of R s due to the cavity density on polymer and nanocomposite thin films.
- 원문이 없습니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기