Efficient bulk heterojunction solar cells based on D-A copolymers as electron donors and PC₇₀BM as electron acceptor

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• 作者：G.D. Sharma^a ; ^c ; ^{sharmagd_in@yahoo.com} ; J.A. Mikroyannidis^b ; Surya Prakash Singh^d
• 关键词：Phenylenevinylene copolymer ; Thiophene ; Pyrrole ; Low band gap ; Bulk heterojunction solar cells ; TiO2 buffer layer
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：16 July, 2012
• 卷：135
• 期：1
• 页码：25-31
• 文件大小：851 K

摘要

Two low band gap conjugated polymers dFont">P1 (alternating phenylenevinylene containing thiophene and pyrrole rings) and dFont">P2 (alternating phenylenevinylene with dithenyl (thienothiadiazole) segments) having optical band gap 1.65 eV and 1.74 eV, respectively, were used as electron donor along with the PC₇₀BM as electron acceptor for the fabrication of bulk heterojunction solar cells. The power conversion efficiency (PCE) of BHJ devices based on dFont">P1:PC₇₀BM and dFont">P2:PC₇₀BM cast from THF solvent is about 2.84%and 2.34%, respectively, which is higher than the BHJ based on PCBM as electron acceptor. We have investigated the effect of mixed (1-chloronaphthalene (CN)/THF) solvent, modification of PEDOT:PSS layer and inserting of TiO₂ layer, on the photovoltaic performance of polymer solar cell. We have achieved power conversion efficiency of 5.07%for the polymer solar cells having structure ITO/PEDOT:PSS (modified)/dFont">P1:PC₇₀BM (CN/THF cast)/TiO₂/Al. The effect of solvent used for spin coating, modification of PEDOT:PSS layer and inclusion of TiO₂ layer has been discussed in detail.