Photochemically Driven Modulated Charge Transfer at Local Contacts between CH3NH3PbI3 and Carboxylated Multiwalled Carbon Nanotubes
| Autor: | Pongthep Prajongtat, Dan Ralf Wargulski, Thomas Unold, Thomas Dittrich |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Surface photovoltage Nanotechnology 02 engineering and technology Electron 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electron transfer General Energy Chemical engineering PEDOT:PSS Particle Density functional theory Charge carrier Physical and Theoretical Chemistry 0210 nano-technology Perovskite (structure) |
| Zdroj: | The Journal of Physical Chemistry C. 120:3876-3881 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b11854 |
| Popis: | Spectral dependent charge separation was investigated by modulated surface photovoltage (SPV) on layer systems with local contacts between CH3NH3PbI3 and PEDOT:PSS mixed with carboxylated multiwalled carbon nanotubes (MWCNT-COOH). In-phase SPV signals changed the sign with increasing amount of MWCNT-COOH in the PEDOT:PSS whereas the spectra could be approximated by a superposition of the spectra obtained for pure PEDOT:PSS and for PEDOT:PSS with 1.6 wt % of MWCNT-COOH. This was not the case for the control sample with pristine MWCNT. For a complex of a single-walled CNT-COOH (SWCNT-COOH) with a perovskite particle, density functional theory calculations showed an electron transfer to the perovskite which was not the case for a pristine SWCNT. Therefore, the transfer of electrons from MWCNT-COOH into illuminated CH3NH3PbI3 dominates fast separation of photogenerated charge carriers at local contacts with MWCNT-COOH. |
| Databáze: | OpenAIRE |
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