Optical Anisotropy and Compositional Ratio of Conductive Polymer PEDOT:PSS and Their Effect on Photovoltaic Performance of Crystalline Silicon/Organic Heterojunction Solar Cells

  • Hajime Shirai
  • Qiming Liu
  • Tatsuya Ohki
  • Ryo Ishikawa
  • Keiji Ueno
Chapter

Abstract

We demonstrate the optical anisotropy of a transparent conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and its effect on the photovoltaic performance of n-type crystalline silicon (n-Si)/PEDOT:PSS heterojunction solar cells. The depth profile of PEDOT/PSS compositional ratio and optical anisotropy depends on the type of polar solvent and/or external DC bias supplied to n-Si substrate during film deposition by spin coating (SC) and chemical mist deposition (CMD). N-Si/PEDOT:PSS heterojunction solar cells with higher PEDOT/PSS compositional ratio near the film surface exhibited better power conversion efficiency η of 12.5% (@2 × 2 cm2) without any light harvesting techniques. In this chapter, the correlation among the optical anisotropy, the depth profile of PEDOT/PSS compositional ratio in conductive polymer PEDOT:PSS, and the photovoltaic performance of n-Si/PEDOT:PSS heterojunction solar cells is demonstrated.

Notes

Acknowledgments

This study was partially supported by a grant from the Japan Science and Technology Agency (JST) and by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan. The authors wish to express their appreciation to Mr. Masayuki Sakurai and Mrs. Yoko Wasai of Horiba-Jobin Yvon Ltd., for the SE measurements. The authors also thank Mrs. Takashi Miyamoto and Koji Funato of Tokyo Direc Co. Ltd., for the allowance of the use of differential mobility analyzer. The one of authors (HS) wish to thank my colleague, Drs. Ishwor Khatri, Jaker Hossain, and Mrs. Shuji Funada, Koki Ichikawa, Kyohei Watanabe, Taiga Hiate, Kyohei Ishikawa, and Yoshinori Imamura for their efforts to this study.

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  • Hajime Shirai
    • 1
  • Qiming Liu
    • 1
  • Tatsuya Ohki
    • 1
  • Ryo Ishikawa
    • 1
  • Keiji Ueno
    • 1
  1. 1.Graduate School of Science and EngineeringSaitama UniversitySaitamaJapan

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