Synthesis and studies of methyl ester substituted thieno-o-quinodimethane fullerene multiadducts for polymer solar cells

详细信息    查看全文

• 作者：Pachagounder Sakthivel^a ; ^{polysathi@gmail.com} ; Tae Won Ban^a ; Siwon Kim^b ; Suhkmann Kim^b ; Yeong-Soon Gal^c ; Eun Ah Chae^d ; Won Suk Shin^d ; Sang-Jin Moon^d ; Jong-Cheol Lee^d ; Sung-Ho Jin^a ; ^{shjin@pusan.ac.kr}
• 关键词：Photovoltaic devices ; Polymer solar cells ; Electron acceptor ; PCBM ; Multiadducts
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：113
• 期：Complete
• 页码：13-19
• 全文大小：743 K

文摘

A new series of fullerene (C₆₀) multiadducts of methyl ester substituted thieno-o-quinodimethane were synthesized for polymer solar cells (PSCs). The synthesized 5-methyl ester thieno-o-quinodimethane fullerene (C₆₀) multiple adducts, such as METFMA (mono-adduct), METFBA (bis-adduct) and METFTA (tris-adduct), showed good solubility in toluene, CHCl₃ and ODCB. Their molecular structures were confirmed by ¹H, ¹³C NMR, UV-visible spectroscopy, DSC, TGA and HRMS Cyclic voltammetry revealing a lowest unoccupied molecular orbital (LUMO) energy level of ?3.65 eV for METFMA, ?3.53 eV for METFBA and ?3.42 eV for METFTA, which is higher than that of PC₆₁BM. The higher LUMO energy level of METFMA, METFBA and METFTA resulted in an enhancement of the open-circuit voltages (V_oc) of PSCs. Device of the multiple adduct acceptors was blended with a P3HT donor with the configuration, ITO/PEDOT/P3HT:acceptor/LiF/Al, using METFMA, METFBA, METFTA and PC₆₁BM as the electron acceptor. The optimal photovoltaic performances were achieved using METFBA and METFTA with power conversion efficiencies of 3.00 % and 2.93 % , respectively. These results were comparable to the device conducted with P3HT:PC₆₁BM (3.42 % ) under the same conditions.