Non-covalently functionalized single walled carbon nanotube/poly(3,4ethylenedioxythiophene):poly(styrenesulfonate) nanocomposites for organic photovoltaic cell

• Published in: Synthetic metals 2013-10, Vol.181, p.92-97
• Main Authors: Jin, Sung Hwan, Cha, Seung Il, Jun, Gwang Hoon, Oh, Jae Young, Jeon, Seokwoo, Hong, Soon Hyung
• Format: Article
• Language: English
• Subjects: Applied sciences; Carbon nanotubes; Composites; Energy; Exact sciences and technology; Forms of application and semi-finished materials; Functionalization; Hole conducting layer; Natural energy; Organic photovoltaic cell; Photovoltaic conversion; Poly(3,4ethylenedioxythiophene); Polymer industry, paints, wood; Solar cells. Photoelectrochemical cells; Solar energy; Technology of polymers
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2013.08.018

•We fabricated SWNT/PEDOT:PSS nanocomposites by using non-covalently functionalized SWNTs.•Non-covalently functionalized SWNT/PEDOT:PSS showed higher electrical conductivity.•Non-covalently functionalized SWNT/PEDOT:PSS was applied in OPVC as hole transport layer.•OPVC with non-covalently functionalized SWNT/PEDOT:PSS resulted in an increase of PCE. In this study, we developed a non-covalent functionalization method to disperse single walled CNTs (SWNTs) with minimal loss of electrical properties. SWNTs were non-covalently functionalized by 1-aminopyrene (AP-SWNTs), and covalently functionalized SWNTs (carboxylate-SWNTs) were fabricated by strong acid treatment for comparing the properties of functionalized SWNTs. By using functionalized SWNTs, SWNT/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) nanocomposites were fabricated as transparent conductive films. AP-SWNT/PEDOT:PSS nanocomposites showed higher electrical conductivity (sheet resistance: 634Ω/sq) at a similar optical transmittance compared to raw PEDOT:PSS (1555Ω/sq) and carboxylate SWNT/PEDOT:PSS nanocomposites (933Ω/sq) due to homogeneously dispersed AP-SWNTs in matrix with minimal damages during the functionalization. We also applied the AP-SWNT/PEDOT:PSS nanocomposites as a hole conducting layer in an organic photovoltaic cell (OPVC) application. Power conversion efficiency (PCE) of the OPVC using AP-SWNT/PEDOT:PSS was enhanced from 2.3% to 3.0% compared to an OPVC using raw PEDOT:PSS. The main reason for this enhancement of the PCE was thought to be the increase of JSC due to effective hole transport and collection by highly conductive, AP-SWNT/PEDOT:PSS nanocomposites.