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Control of the oxidation level of graphene oxide for high efficiency polymer solar cells

机译：高效聚合物太阳能电池氧化石墨烯氧化水平的控制

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摘要

Graphene oxides (GOs) have been used as interfacial layers for fabricating more stable organic solar cells (OSCs). However, the influence of the degree of oxidation of GOs on their optoelectronic properties has been ignored. In this article, a series of GOs with different degrees of oxidation were successfully synthesized, by controlling the amount of oxidant KMnO4 during the oxidation process of graphite. With increasing oxidation level, more oxygenated functional groups were attached to the carbon basal plane and more defects were introduced into the GO sheets, resulting in an increased work function (WF) and a decreased conductivity. Meanwhile, the film-forming property of GOs was improved with increasing oxidation level, which is attributed to the adequate exfoliation of the GO sheets. After carefully controlling the oxidation level of GOs, the OSCs with GOs as the hole transport layer (HTL) show an efficiency value of 3.0%, comparable to that with poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) (3.2%), originating from the good film-forming property, appropriate work function and high conductivity.
机译：氧化石墨烯（GO）已被用作界面层，用于制造更稳定的有机太阳能电池（OSC）。但是，GO的氧化程度对其光电性能的影响已被忽略。通过控制石墨氧化过程中氧化剂KMnO4的含量，成功合成了一系列氧化程度不同的GO。随着氧化水平的提高，更多的含氧官能团附着在碳基面上，并且更多的缺陷被引入到GO片中，导致功函数（WF）的增加和电导率的降低。同时，GO的成膜性能随着氧化水平的提高而提高，这归因于GO片材的充分剥离。在仔细控制GO的氧化水平后，以GO为空穴传输层（HTL）的OSC的效率值为3.0％，与聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）相当）（3.2％），源于良好的成膜性，适当的功函和高电导率。

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