Influences of device structures on microstructure-correlated photovoltaic characteristics of organic solar cells

Fu Chiao Wu, Cheng Chi Yang, Po Tsung Tseng, Wei Yang Chou, Horng Long Cheng

研究成果: Conference contribution

1 引文 斯高帕斯(Scopus)

摘要

Photovoltaic characteristics of organic solar cells (OSCs) are correlated with microstructural qualities of active layers (ALs). Numerous efforts focused on improving process conditions of ALs to attain effective microstructures to achieve high-efficiency OSCs. Aside from AL process conditions, layer properties under AL can also influence microstructural qualities of AL. In this study, we adopted poly(3-hexylthiophene) (P3HT):(6,6)-phenyl C61-butyric acid methyl ester (PCBM) mixture as AL, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) as hole extraction layer, and branched polyethyleneimine (BPEI) as electron extraction layer to prepare OSCs with different device structures, that is, normal type (PEDOT:PSS/P3HT:PCBM/BPEI) and inverted type (BPEI/P3HT:PCBM/PEDOT:PSS) structures. We discovered that although devices have similar layer components, they have different photovoltaic characteristics. Inverted devices demonstrated higher power conversion efficiency than normal devices. Various methods, including absorption spectroscopy and microscopy, were used to study AL microstructures of different devices. We observed that P3HT crystallites grown on BPEI had longer vertical size and shorter horizontal size compared with those grown on PEDOT:PSS; these properties could result from larger interfacial tension of P3HT with BPEI than with PEDOT:PSS. Observed shape of P3HT crystallites in inverted devices facilitated efficient charge transport to electrodes and suppressed current leakage. As a result, inverted devices generated improved photovoltaic performance.

原文English
主出版物標題Organic Photonic Materials and Devices XIX 2017
編輯Francois Kajzar, Toshikuni Kaino, Christopher E. Tabor, Yasuhiro Koike
發行者SPIE
ISBN(電子)9781510606432
DOIs
出版狀態Published - 2017
事件Organic Photonic Materials and Devices XIX 2017 - San Francisco, United States
持續時間: 2017 一月 302017 二月 1

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
10101
ISSN(列印)0277-786X
ISSN(電子)1996-756X

Other

OtherOrganic Photonic Materials and Devices XIX 2017
國家/地區United States
城市San Francisco
期間17-01-3017-02-01

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學
  • 電腦科學應用
  • 應用數學
  • 電氣與電子工程

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