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PEDOT:PSS/CuCl Composite Hole Transporting Layer for Enhancing the Performance of 2D Ruddlesden-Popper Perovskite
Xun Zhu1, Runqi Zhang1, Min Li1
1State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
The Journal of Physical Chemistry Letters
|June 27, 2022
Summary
Copper chloride doping enhances Poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) as a hole transport layer in 2D perovskite solar cells, improving efficiency and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Semiconductor Physics
Background:
- Poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) is a widely used hole transport layer (HTL) in 2D Ruddlesden-Popper perovskite solar cells (PSCs).
- Intrinsic issues with PEDOT:PSS, such as high acidity and energy level mismatch, limit device performance and longevity.
- Addressing these limitations is crucial for advancing PSC technology.
Purpose of the Study:
- To investigate the effect of copper chloride (CuCl) doping on PEDOT:PSS as an HTL in 2D RP PSCs.
- To improve the performance and stability of 2D RP PSCs by modifying the PEDOT:PSS layer.
- To explore the potential of CuCl-doped PEDOT:PSS for large-scale manufacturing.
Main Methods:
- Doping PEDOT:PSS with copper chloride (CuCl).
- Fabricating inverted 2D Ruddlesden-Popper perovskite solar cells using the modified PEDOT:PSS:CuCl layer.
- Characterizing the morphology, crystallinity, and energy levels of the modified HTL and perovskite films.
- Evaluating the power conversion efficiency and long-term stability of the fabricated solar cells.
Main Results:
- CuCl doping effectively lowered the acidity and tuned the work function of PEDOT:PSS.
- The PEDOT:PSS/CuCl composite substrate improved the wettability, leading to uniform 2D perovskite films with vertically oriented crystals and enhanced crystallinity.
- The modified PEDOT:PSS:CuCl based inverted 2D RP PSCs achieved a maximum power conversion efficiency of 13.36%.
- The devices demonstrated improved long-term stability compared to control devices.
Conclusions:
- CuCl doping is an effective strategy to overcome the intrinsic limitations of PEDOT:PSS in 2D RP PSCs.
- The modified PEDOT:PSS:CuCl HTL enhances perovskite film quality and device performance.
- This approach shows significant promise for the mass production of efficient and stable perovskite solar cells.
