Characterisation of potential donor acceptor pairs for polymer solar cells by ESR, optical and electrochemical investigations

被引：27

作者：

Sensfuss, S ^{[1
]}

Al-Ibrahim, M ^{[1
]}

Konkin, A ^{[1
]}

Nazmutdinova, G ^{[1
]}

Zhokhavets, U ^{[1
]}

Gobsch, G ^{[1
]}

Egbe, DAM ^{[1
]}

Klemm, E ^{[1
]}

Roth, HK ^{[1
]}

机构：

[1] TITK Inst Rudolstadt, Phys Mater Res, D-07407 Rudolstadt, Germany

来源：

ORGANIC PHOTOVOLTAICS IV | 2004年 / 5215卷

关键词：

polymer solar cells; conjugated polymers; fullerene; light-induced electron spin resonance (LESR); cyclovoltammetry; poly(phenylene vinylene)-poly(phenylene ethynylene)-copolymers (PPV-PPE); photoluminescence; absorption coefficient;

D O I：

10.1117/12.505628

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this report new PPV-PPE copolymers DE 69, DE 11 were compared with the state of the art materials MDMO-PPV and poly(3-alkylthiophenes) (P3DDT, P3OT). The optical band gap energy of the two copolymers DE 69, DE11 is somewhat higher than that one of MDMO-PPV. The electrochemical band gap was found to be lower for DE 69, DE11 related to for MDMO-PPV. The absorption coefficient of the new PPV-PPE copolymers is higher than for MDMO-PPV but in the same order of magnitude. Films from composites of MDMO-PPV/ PCBM and DE69 or DE11 with PCBM show a clear photoluminescence quenching effect. At 77 K two kinds of LESR signals were identified, one of polarons (P+.) and one of radical anions of fullerenes. The LESR results show strong differences in kinetics between the separation and recombination processes of photoexcited charge carriers. The relaxation rates of paramagnetic centres were estimated by microwave power saturation experiments. Photovoltaic devices were prepared under ambient conditions on flexible PET-ITO foils with MDMO-PPV/ PCBM (1:3 wt. %) with eta(AM1.5) = 2.4 % and DE 69/ PCBM (1:3 wt. %) with eta(AM1.5) = 1.75 % (A=0.25 cm(2), P-in= 100 mW/cm(2)).

引用

页码：129 / 140

页数：12

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