Ring-protected small molecules for organic photovoltaics

Sun, Jianyuan; Zhang, Lianjie; Dubey, Ashishi; Venkatesan, Swaminathan; Lin, Tao; Sanow, Logan P.; Hung, Yu-Chueh; Sykes, Andrew G.; He, Hongshan; Qiao, Qiquan; Zhang, Cheng

doi:10.1117/12.2025762

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…Recently, in parallel to polymer solar cells, , modified PEDOT:PSS electrodes have also been reported for application in perovskite solar cells . In the last several years, perovskite solar cells were of great interest due to a rapid increase in their power conversion efficiency (PCE) compared to polymer solar cells, − dye sensitized solar cells, − small molecule solar cells, and copper zinc tin sulfide (CZTS) solar cells . The high PCE for perovskite solar cells resulted from their high absorption coefficient and charge carrier diffusion length. − Different device architectures of perovskite solar cells, such as planar and mesostructured cells, were used, but the p-i-n structured planar perovskite solar cells have shown flexibility and lower temperature processing.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Friendly Plasma-Treated PEDOT:PSS as Electrodes for ITO-Free Perovskite Solar Cells

Vaagensmith

Reza

Hasan

et al. 2017

ACS Appl. Mater. Interfaces

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Solution processed poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) transparent electrodes (TEs) offer great potential as a low cost alternative to expensive indium tin oxide (ITO). However, strong acids are typically used for enhancing the conductivity of PEDOT:PSS TEs, which produce processing complexity and environmental issues. This work presents an environmentally friendly acid free approach to enhance the conductivity of PEDOT:PSS using a light oxygen plasma treatment, in addition to solvent blend additives and post treatments. The plasma treatment was found to significantly reduce the sheet resistance of PEDOT:PSS TEs from 85 to as low as 15 Ω sq, which translates to the highest reported conductivity of 5012 S/cm for PEDOT:PSS TEs. The plasma treated PEDOT:PSS TE resulted in an ITO-free perovskite solar cell efficiency of 10.5%, which is the highest reported efficiency for ITO-free perovskite solar cells with a PEDOT:PSS electrode that excludes the use of acid treatments. This research presents the first demonstration of this technology. Moreover, the PEDOT:PSS TEs enabled better charge extraction from the perovskite solar cells and reduced hysteresis in the current density-voltage (J-V) curves.

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