Solution‐Processed Chemically Non‐Destructive Filter Transfer of Carbon‐Nanotube Thin Films onto Arbitrary Materials. Issue 22 (11th October 2021)

• Record Type: Journal Article
• Authors: Ishizaki, Manabu; Satoh, Daiki; Ando, Rin; Funabe, Mikuto; Matsui, Jun; Kurihara, Masato
• Is Part Of: Advanced materials interfaces. Volume 8:Issue 22(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-11
• Subjects: carbon nanotube thin films -- perovskite solar cells -- solution‐processed devices -- top‐contact electrodes; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202100953
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Filter‐transfer methods of single‐walled carbon‐nanotube (SWNT) thin films have been widely employed to fabricate state‐of‐the‐art electronics and photonics devices with highly transparent and conductive electrodes; however, a challenge remains for all solution‐processable technologies to overcome substrates' destruction due to their solvent incompatibility. Here, an advanced method of transferring SWNT thin films onto arbitrary material substrates by adopting chemically stable and flexible polytetrafluoroethylene (PTFE) membranes is reported. Filtrated SWNT thin films on PTFE membranes (PTFE@SWNTs) press‐freely adhere to not only flat but curved substrates by their solvent‐wettability and flexibility natures, and are spontaneously transferred after low‐temperature evaporation of the wet solvents and peeling of the PTFE membrane. SWNT thin films transferred onto polyethylene terephthalate films show sheet resistance values of ≈400 Ω □ −1 at ≈90% transmittance, which are drastically decreased to ≈50 Ω □ −1 at ≈65% from ≈100 Ω □ −1 at ≈80%. The wet solvents are suitably displaced based on solvent‐compatibility experiments with the substrates. Topically, it is demonstrated that the solvent‐wetted PTFE@SWNT can be non‐destructively placed onto a perovskite (CH3 NH3 PbI3 ) substrate via the as‐displaced various organic solvents. A pre‐doping process of PTFE@SWNTs is possible by using a HNO3 aqueous solution. The HNO3 ‐doped SWNT thin film is successfully transferred onto the perovskite substrate. Abstract : A versatile and convenient solution‐processed method for transferring single‐walled carbon nanotube (SWNT) thin films onto various substrates is reported. SWNT thin films are non‐destructively transferred onto the arbitrary shape and/or solvent‐sensitive materials such as a perovskite (CH3 NH3 PbI3 ) layer from them filtered through polytetrafluoroethylene (PTFE) membranes, PTFE@SWNTs. Furthermore, a pre‐doping process of SWNTs using HNO3 is possible using PTFE@SWNTs.