Efficient Perovskite Hybrid Solar Cells by Highly Electrical Conductive PEDOT:PSS Hole Transport Layer
Efficient Perovskite Hybrid Solar Cells by Highly Electrical Conductive PEDOT:PSS Hole Transport Layer
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DOI：
10.1002/aenm.201501773
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发表时间：
2016-02-04
影响因子：
27.8
通讯作者：
Gong, Xiong
中科院分区：
文献类型：
--
作者：
Huang, Xu;Wang, Kai;Gong, Xiong
DOI：10.1002/aenm. 201501773中所述的方法和由此获得的pero-HSC的PCE。[23因此，开发有效的空穴传输途径以进一步提高光电流并扩大pero-HSC的FF是非常重要的。在这种情况下，我们采用高导电性、聚环氧乙烷（PEO）掺杂的PEDOT：PSS作为PHJ pero-HSC的HEL。PEO掺杂的PEDOT：PSS HEL的显著增强的电导率为从钙钛矿活性层到ITO阳极的空穴提取、传输和收集提供了有效的途径。结果，观察到23.42 mA cm-2的显著增强的短路电流（JSC）、0.88 V的略微增大的开路电压（VOC）、80.10%的增强的FF和16.52%的相应显著增强的PCE，这与来自与原始PEDOT：PSS HEL结合的PHJ pero-HSC的PCE相比增强了约45%。此外，与PEO掺杂的PEDOT：PSS HEL结合的PHJ pero-HSC具有高器件重现性和低光电流滞后。所有这些结果表明，我们提供了一种简单但有效的方法来提高pero-HSC的PCE。方案1呈现了PEDOT：PSS和PEO的分子结构以及PHJ pero-HSC的器件结构。为了进行比较研究，制备并表征了具有PEO掺杂的PEDOT：PSS HEL和原始PEDOT：PSS HEL两者的pero-HSC。由于其高导电性，选择可溶液加工的PEO掺杂的PEDOT：PSS薄膜作为HEL。[25]较高导电性的PEO掺杂的PEDOT：PSS HEL将使得空穴能够有效地传输通过PEO掺杂的PEDOT：PSS HEL，然后由ITO阳极以较少的能量损失收集。[26-30]因此，从与PEO掺杂的PEDOT：PSS HEL结合的PHJ pero-HSC预期高JSC和大FF。图1呈现了PEO掺杂的PEDOT：PSS HEL和与PEO掺杂的PEDOT：PSS HEL结合的pero-HSC的PCE的电导率作为PEDOT：PSS中PEO浓度的函数，其中原始PEDOT：PSS HEL和PEO掺杂的PEDOT：PSS HEL的厚度相同，为约75 nm。PEDOT：PSS薄膜的电导率从原始PEDOT：PSS薄膜的0.2 S cm-1提高到PEO掺杂的PEDOT：PSS薄膜的13.6、147.9、185.9和348.1 S cm-1，其中PEO的掺杂浓度分别为0.3、0.5、0.8和1.2体积%。这些结果表明，PEO掺杂的PEDOT：PSS层的电导率显著高于原始PEDOT：PSS层的电导率。PEO掺杂的PEDOT：PSS层的电导率的增强源自于PEDOT在双极化子态的比例的增加和PEO掺杂的PEDOT：PSS的调谐的膜形态。[25]掺杂PEDOT：PSS HEL的pero-HSC的PCE显著高于掺杂PEDOT：PSS HEL的pero-HSC。由于其高的功率转换效率（PCE）以及钙钛矿材料的超光电性能和溶液可加工性，pero-HSC在过去几年中引起了极大的关注。[1-3]为了增强PCE，在pero-HSC中采用空穴提取层（HEL）和电子提取层（EEL）两者，以充分且有效地提取电荷载流子并将电荷载流子从钙钛矿光采集器层传输到相应的电极。[4-8]例如，在具有ITO/PEDOT器件结构的平面异质结（PHJ）pero-HSC中，
DOI: 10.1002/aenm. 201501773 and the PCEs of pero-HSCs thereby.[23, 24] Therefore, it is very important to develop an efficient hole transport pathway to further boost photocurrent and enlarge FF of pero-HSCs. In this scenario, we employ the highly electrical conductive, polyethylene oxide (PEO)-doped PEDOT: PSS as the HEL for the PHJ pero-HSCs. The dramatically enhanced electrical conductivity of the PEO-doped PEDOT: PSS HEL provides an efficient pathway for the hole extraction, transport, and collection from the perovskite active layer to the ITO anode. As a result, a significantly enhanced short-circuit current (JSC) of 23.42 mA cm− 2, a slightly enlarged open-circuit voltage (VOC) of 0.88 V, an enhanced FF of 80.10% and a correspondingly dramatically enhanced PCE of 16.52%, which is a≈ 45% enhancement as compared with that from the PHJ pero-HSCs incorporated with the pristine PEDOT: PSS HEL, are observed. Moreover, the PHJ pero-HSCs incorporated with the PEO-doped PEDOT: PSS HEL possess high device reproducibility and low photocurrent hysteresis. All these results demonstrate that we provide a simple but efficient way to boost the PCEs of pero-HSCs. Scheme 1 presents the molecular structures of PEDOT: PSS and PEO, and the device structure of the PHJ pero-HSCs. For comparison study, the pero-HSCs with both the PEO-doped PEDOT: PSS HEL and the pristine PEDOT: PSS HEL are fabricated and characterized. The solution-processible PEO-doped PEDOT: PSS thin film is selected as the HEL due to its highly electrical conductivity.[25] The higher electrical conductive PEO-doped PEDOT: PSS HEL would enable the holes being efficiently transported through the PEO-doped PEDOT: PSS HEL and then collected by the ITO anode with less energy loss.[26–30] Thus, high JSC and large FF are anticipated from the PHJ pero-HSCs incorporated with the PEO-doped PEDOT: PSS HEL. Figure 1 presents the electrical conductivities of the PEO-doped PEDOT: PSS HEL and the PCEs of pero-HSCs incorporated with the PEO-doped PEDOT: PSS HEL as a function of the concentrations of PEO in the PEDOT: PSS, where the thickness of the pristine PEDOT: PSS HEL and the PEO-doped PEDOT: PSS HEL are the same, which is≈ 75 nm. The electrical conductivities of the PEDOT: PSS thin films are enhanced from 0.2 S cm− 1 for the pristine PEDOT: PSS thin film to 13.6, 147.9, 185.9, and 348.1 S cm− 1 for the PEO-doped PEDOT: PSS thin films where the doping concentrations of PEO are 0.3, 0.5, 0.8, and 1.2 vol%, respectively. These results indicate that the electrical conductivities of the PEO-doped PEDOT: PSS layers are significantly higher than that of the pristine PEDOT: PSS layer. The enhanced electrical conductivity of the PEO-doped PEDOT: PSS layer is originated from the increased ratios of PEDOT in the bipolaron states and the tuned film morphology of PEDOT: PSS by PEO dopant.[25] It is also found that the PCEs of the pero-HSCs incorporated with the PEO-doped PEDOT: PSS HEL are significantly higherPerovskite hybrid solar cells (pero-HSCs) have attracted great attention in past years due to their high power conversion efficiencies (PCEs) and the super optical and electrical properties and solution processibility of perovskite materials.[1–3] To boost the PCEs, both the hole extraction layer (HEL) and electron extraction layer (EEL) are employed in pero-HSCs to sufficiently and effectively extract and transport the charge carriers from the perovskite light-harvester layer to the corresponding electrodes.[4–8] For example, in the planner heterojunction (PHJ) pero-HSCs with a device structure of ITO/PEDOT …