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

• DOI: 10.1021/acs.nanolett.5b02490
• Publication Date: 2015-09-01T15:48:06Z
• Authors: Il Jeon; Takaaki Chiba; Clement Delacou; Yunlong Guo; Antti Kaskela; Olivier Reynaud; Esko I. Kauppinen; Shigeo Maruyama; Yutaka Matsuo
• Keywords: Blocking (statistics)

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' hydrophobicity doping issues in SC devices. These include changing wettability of poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PSS), MoO3 thermal doping, HNO3(aq) with various dilutions from 15 70 v/v% minimize its instability toxic nature. discovered that isopropanol (IPA) modifiedPSS works better than surfactant as an electron-blocking layer on SWNTs SCs due superior wettability, whereas is not compatible owing energy level mismatching. Diluted HNO3 (35 v/v%)-doped SWNT-based device produced the highest PCE 6.32% among SCs, which 70% indium tin oxide (ITO)-based (9.05%). Its flexible application showed a 5.38% polyethylene terephthalate (PET) substrate.