Yang Yi, Kang Qian, Liao Qing, Zheng Zhong, He Chang, Xu Bowei, Hou Jianhui
State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
ACS Appl Mater Interfaces. 2020 Sep 2;12(35):39462-39470. doi: 10.1021/acsami.0c08671. Epub 2020 Aug 20.
The development of electrode interlayers for hole extraction is a great challenge in the field of organic solar cells (OSCs). At present, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is the only solution-processed anode interlayer (AIL) that can be used to achieve power conversion efficiencies (PCEs) over 15% in OSC devices, even though there are several well-known drawbacks in practical applications of PEDOT:PSS. Herein, we use an inorganic molecular cluster (IMC) as the AIL for making highly efficient and large-area OSCs. The IMC possesses several advantages in serving as the AIL, such as neutral pH, excellent optical transmittance, high work function, good film-forming properties, and low cost. OSCs using the IMC can achieve a high PCE of 13.38%, which is superior to the PCE of the PEDOT:PSS device. This is among the few examples of OSC devices with solution-processed and pH neutral AILs showing higher PCE than PEDOT:PSS devices. Ultraviolet photoelectron spectroscopy and electron spin resonance results indicate the formation of inorganic-organic heterojunction, which is crucial for efficient hole extraction. More importantly, the IMC is compatible with printing processing. Using a blade-coated IMC film, we fabricated a large-area OSC of 1 cm and a high PCE of 9.5% was achieved.
用于空穴提取的电极中间层的开发是有机太阳能电池（OSC）领域的一项巨大挑战。目前，聚（3,4 - 乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）是唯一可通过溶液处理的阳极中间层（AIL），即便在PEDOT:PSS的实际应用中存在几个众所周知的缺点，但它仍可用于使OSC器件实现超过15%的功率转换效率（PCE）。在此，我们使用一种无机分子簇（IMC）作为AIL来制备高效且大面积的OSC。IMC在用作AIL方面具有多个优点，如中性pH值、优异的光学透过率、高功函数、良好的成膜性能以及低成本。使用IMC的OSC可实现13.38%的高PCE，这优于PEDOT:PSS器件的PCE。这是少数几个具有溶液处理且pH值中性的AIL的OSC器件，其PCE高于PEDOT:PSS器件的例子之一。紫外光电子能谱和电子自旋共振结果表明形成了无机 - 有机异质结，这对于高效空穴提取至关重要。更重要的是，IMC与印刷工艺兼容。使用刮刀涂布的IMC薄膜，我们制备了面积为1平方厘米的大面积OSC，并实现了9.5%的高PCE。
