Improved power conversion efficiency of perovskite solar cells using highly conductive WOx doped PEDOT:PSS†,New Journal of Chemistry

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Improved power conversion efficiency of perovskite solar cells using highly conductive WOx doped PEDOT:PSS†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-08-30 00:00:00 , DOI: 10.1039/c8nj04131h
Anil Kanwat _{1,

2,

3,

4,

5} , V. Sandhya Rani _{1,

2,

3,

4,

5} , Jin Jang _{1,

2,

3,

4,

5}

Affiliation

Poly(3,4-thylenedioxythiophene):poly(styrene sulfonate), PEDOT:PSS, is a popular and cost effective conducting polymer for electrodes that can also be used as a hole transport layer (HTL) in optoelectronics. In this article, we investigated the role of ethylene glycole (EG) in the conductivity enhancement of PEDOT:PSS and WO_x doped PEDOT:PSS films. Multiple EG solvent treatments increase the conductivity up to 3000 S cm⁻¹ (PEDOT:PSS) and 1980 S cm⁻¹ (PEDOT:PSS:WO_x). EG treated PEDOT:PSS:WO_x thin films exhibited transmittance as high as 95% in the visible range and sheet resistance as low as 35 Ω sq⁻¹. And, PEDOT:PSS films exhibited sheet resistance of 25 Ω sq⁻¹ at 90% transmittance, which is the lowest value reported to date to the best of our knowledge. Additionally, thin films treated with EG multiple times exhibit improved thermal stability; thin films annealed at 250 °C have shown a remarkable stable conductivity. Furthermore, these layers are investigated as HTLs for high efficiency perovskite solar cells (PSCs). Neat PEDOT:PSS and PEDOT:PSS:WO_x, and EG treated PEDOT:PSS and PEDOT:PSS:WO_x integrated in PSCs demonstrated a power conversion efficiency (PCE) of 9.17%, 10.42%, 12.31% and 12.69%, respectively. The improved performance of cells with modified PEDOT:PSS HTLs results in improved current density and fill factor.

中文翻译：

使用高导电性WO _x掺杂的PEDOT：PSS改进了钙钛矿太阳能电池的功率转换效率†

聚（3,4-亚乙二氧基噻吩）：聚（苯乙烯磺酸盐），PEDOT：PSS是一种流行且经济高效的电极导电聚合物，也可以用作光电器件中的空穴传输层（HTL）。在本文中，我们研究了乙二醇（EG）在PEDOT：PSS和WO _x掺杂的PEDOT：PSS薄膜电导率增强中的作用。多次EG溶剂处理可将电导率提高到3000 S cm ^-1（PEDOT：PSS）和1980 S cm ^-1（PEDOT：PSS：WO _x）。经过EG处理的PEDOT：PSS：WO _x薄膜在可见光范围内的透射率高达95％，薄层电阻低至35Ωsq ^-1。而且，PEDOT：PSS膜的薄层电阻为25Ωsq ^-1以90％的透射率计算，据我们所知，这是迄今为止报告的最低值。另外，用EG多次处理的薄膜表现出改善的热稳定性；在250°C退火的薄膜显示出显着的稳定电导率。此外，这些层已被用作高效钙钛矿太阳能电池（PSC）的HTL。整齐的PEDOT：PSS和PEDOT：PSS：WO _x以及集成在PSC中的经过EG处理的PEDOT：PSS和PEDOT：PSS：WO _x分别显示出9.17％，10.42％，12.31％和12.69％的功率转换效率（PCE）。修改后的PEDOT：PSS HTL改善了电池的性能，从而改善了电流密度和填充因子。

更新日期：2018-08-30

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