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Improved Stability of Interfacial Energy-Level Alignment in Inverted Planar Perovskite Solar Cells.

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  • 1School of Chemical Engineering , Sungkyunkwan University , 2066 Seobu-ro , Jagnan-gu, Suwon , Gyeonggi-do 16419 , Republic of Korea.

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|May 16, 2018
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Summary

A new copolymer, PEDOT:P(SS-co-TFPMA), enhances perovskite solar cell performance by improving hole extraction layers. This material offers higher work functions and stability, boosting power conversion efficiency and device longevity.

Keywords:
PEDOT:P(SS-co-TFPMA)PEDOT:PSShole extraction layerinverted planar perovskite solar cellstetrafluoropropylmethacrylate

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a common hole extraction layer (HEL) in perovskite solar cells (PSCs).
  • PEDOT:PSS suffers from low and unstable work functions (WFs), hindering optimal energy level alignment with perovskite layers and limiting photovoltaic performance.
  • This instability leads to performance deterioration in p-i-n PSCs.

Purpose of the Study:

  • To develop an alternative HEL material that overcomes the limitations of conventional PEDOT:PSS.
  • To synthesize and evaluate a novel copolymer, P(SS-co-TFPMA), as a superior HEL for inverted planar p-i-n PSCs (IP-PSCs).
  • To investigate the impact of the new HEL on device performance, stability, and work function characteristics.

Main Methods:

  • Synthesis of a P(SS-co-TFPMA) ionomer copolymer.
  • Fabrication of PEDOT:P(SS-co-TFPMA) films and comparison with PEDOT:PSS films.
  • Characterization of film homogeneity, phase stability, surface hydrophobicity, and work function.
  • Fabrication and testing of IP-PSCs using both conventional PEDOT:PSS and the novel PEDOT:P(SS-co-TFPMA) HEL.

Main Results:

  • The PEDOT:P(SS-co-TFPMA) solution and film showed excellent homogeneity and phase stability.
  • The PEDOT:P(SS-co-TFPMA) film exhibited a higher work function and hydrophobic surface compared to PEDOT:PSS, attributed to electron-withdrawing fluorinated groups.
  • The PEDOT:P(SS-co-TFPMA) HEL maintained its work function after perovskite coating, unlike PEDOT:PSS.
  • IP-PSCs with PEDOT:P(SS-co-TFPMA) demonstrated improved open-circuit voltage (0.98 V), short-circuit current (19.66 mA/cm²), and fill factor (82.43%).
  • This resulted in a 15% increase in power conversion efficiency and enhanced device stability.

Conclusions:

  • The synthesized PEDOT:P(SS-co-TFPMA) copolymer is a promising alternative HEL for PSCs.
  • Its superior work function, stability, and hydrophobic nature lead to enhanced energy-level alignment and improved device performance.
  • The novel HEL contributes to higher power conversion efficiency and better operational stability in inverted planar PSCs.