Single-Walled Carbon Nanotube Film as Electrode in Indium-Free Planar Heterojunction Perovskite Solar Cells: Investigation of Electron-Blocking Layers and Dopants

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• 作者：Il Jeon ; Takaaki Chiba ; Clement Delacou ; Yunlong Guo ; Antti Kaskela ; Olivier Reynaud ; Esko I. Kauppinen ; Shigeo Maruyama ; Yutaka Matsuo
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6665-6671
• 全文大小：428K
• ISSN：1530-6992

文摘

In this work, we fabricated indium-free perovskite solar cells (SCs) using direct- and dry-transferred aerosol single-walled carbon nanotubes (SWNTs). We investigated diverse methodologies to solve SWNTs鈥?hydrophobicity and doping issues in SC devices. These include changing wettability of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT:PSS), MoO₃ thermal doping, and HNO₃(aq) doping with various dilutions from 15 to 70 v/v% to minimize its instability and toxic nature. We discovered that isopropanol (IPA) modified PEDOT:PSS works better than surfactant modified PEDOT:PSS as an electron-blocking layer on SWNTs in perovskite SCs due to superior wettability, whereas MoO₃ is not compatible owing to energy level mismatching. Diluted HNO₃ (35 v/v%)-doped SWNT-based device produced the highest PCE of 6.32% among SWNT-based perovskite SCs, which is 70% of an indium tin oxide (ITO)-based device (9.05%). Its flexible application showed a PCE of 5.38% on polyethylene terephthalate (PET) substrate.