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首页> 外文期刊>Organic Electronics >Voc enhancement in polymer solar cells with isobenzofulvene-C_(60) adducts
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Voc enhancement in polymer solar cells with isobenzofulvene-C_(60) adducts

机译：用异苯并富勒烯-C_（60）加合物提高聚合物太阳能电池的Voc

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摘要

We report the use of isobenzofulvene-C_(60) adducts in bulk heterojunction organic solar cells, synthesized via the [4 + 2] cycloaddition of C_(60) with an in situ generated isobenzofulvene intermediate. The LUMO energy levels of these adducts are 20-180 meV higher than that of PCBM ([6,6]-phenyl-C_(61)-butyric acid methyl ester). This large increase of the LUMO level is attributed to cofacial π-orbital interactions between the fullerene surface and the isobenzofulvene π-system (aromatic ring and double bond). Raised LUMO levels of fullerenes, together with their desirably slow recombination dynamics, led to higher open-circuit voltages (V_(oc)) in bulk heterojunction polymer solar cells (up to 0.75 V for bisadducts) relative to cells tested in parallel using the well-known PCBM as the fullerene acceptor. In addition to enhanced Voc, the short-circuit current densities (J_(sc)) were improved in the devices containing the epoxide analogs of the isobenzofulvene-C_(60). Notably the epoxide derivative of the monoadduct (IBF-Ep) exhibited ～20% enhancement of power conversion efficiency (PCE) compared to reference P3HT:PCBM solar cells. A combination of optical and electronic methods was used to investigate the origin of the PCE enhancement observed with these new fullerene acceptors with particular attention to the increased Vocs.
机译：我们报告了在异质结有机太阳能电池中使用异苯并富勒烯-C_（60）加合物，通过C_（60）与原位生成的异苯并富勒烯中间体的[4 + 2]环加成合成。这些加合物的LUMO能级比PCBM（[6,6]-苯基-C_（61）-丁酸甲酯）高20-180 meV。 LUMO含量的大幅增加归因于富勒烯表面与异苯并富烯π系统（芳环和双键）之间的表面π轨道相互作用。相对于使用阱平行测试的电池，富勒烯的LUMO水平升高，以及合乎需要的缓慢重组动力学，会导致体异质结聚合物太阳能电池的开路电压（V_（oc））升高（双加合物高达0.75 V）。众所周知的PCBM是富勒烯受体。除了提高了Voc之外，在包含异苯并富勒烯-C_（60）环氧类似物的器件中，短路电流密度（J_（sc））也得到了改善。值得注意的是，与参考P3HT：PCBM太阳能电池相比，单加合物的环氧衍生物（IBF-Ep）的功率转换效率（PCE）提高了约20％。光学和电子方法的组合被用来研究用这些新的富勒烯受体观察到的PCE增强的起源，并特别注意增加的Vocs。

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