Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) Heterojunctions
The incorporation of singlet fission (SF) chromophores in solar cells is expected to bring significant increases in the power conversion efficiency thanks to multiexciton generation. However, efficient charge generation in the device is determined by the energy level alignment (ELA) between the acti...
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doaj-b5d9c7afb5b243dab2cbd8c28a2416152021-09-25T23:54:03ZengMDPI AGChemistry2624-85492021-07-0135374475210.3390/chemistry3030053Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) HeterojunctionsRoberto Costantini0Albano Cossaro1Alberto Morgante2Martina Dell’Angela3CNR-IOM Laboratorio TASC, SS 14 Km 163.5, I-34149 Trieste, ItalyCNR-IOM Laboratorio TASC, SS 14 Km 163.5, I-34149 Trieste, ItalyCNR-IOM Laboratorio TASC, SS 14 Km 163.5, I-34149 Trieste, ItalyCNR-IOM Laboratorio TASC, SS 14 Km 163.5, I-34149 Trieste, ItalyThe incorporation of singlet fission (SF) chromophores in solar cells is expected to bring significant increases in the power conversion efficiency thanks to multiexciton generation. However, efficient charge generation in the device is determined by the energy level alignment (ELA) between the active materials, which should favor exciton transport and separation under illumination. By combining ultraviolet photoemission spectroscopy and optical differential reflectance measurements, we determine the ELA in a prototypical SF heterojunction between pentacene (Pc) and perylene-tetracarboxylic-diimide (PTCDI) grown on Ag(111). Time-resolved X-ray photoelectron spectroscopy on such a system reveals light-induced modifications of the ELA; by measuring the transient shift of the core level photoemission lines we observe an accumulation of long-lived holes in the PTCDI within the first hundred picoseconds after the optical pump.https://www.mdpi.com/2624-8549/3/3/53organic heterojunctionpump–probe photoemissionexciton dynamicstransient energy level alignmentinterface dipole |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Roberto Costantini Albano Cossaro Alberto Morgante Martina Dell’Angela |
spellingShingle |
Roberto Costantini Albano Cossaro Alberto Morgante Martina Dell’Angela Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) Heterojunctions Chemistry organic heterojunction pump–probe photoemission exciton dynamics transient energy level alignment interface dipole |
author_facet |
Roberto Costantini Albano Cossaro Alberto Morgante Martina Dell’Angela |
author_sort |
Roberto Costantini |
title |
Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) Heterojunctions |
title_short |
Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) Heterojunctions |
title_full |
Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) Heterojunctions |
title_fullStr |
Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) Heterojunctions |
title_full_unstemmed |
Light-Induced Charge Accumulation in PTCDI/Pentacene/Ag(111) Heterojunctions |
title_sort |
light-induced charge accumulation in ptcdi/pentacene/ag(111) heterojunctions |
publisher |
MDPI AG |
series |
Chemistry |
issn |
2624-8549 |
publishDate |
2021-07-01 |
description |
The incorporation of singlet fission (SF) chromophores in solar cells is expected to bring significant increases in the power conversion efficiency thanks to multiexciton generation. However, efficient charge generation in the device is determined by the energy level alignment (ELA) between the active materials, which should favor exciton transport and separation under illumination. By combining ultraviolet photoemission spectroscopy and optical differential reflectance measurements, we determine the ELA in a prototypical SF heterojunction between pentacene (Pc) and perylene-tetracarboxylic-diimide (PTCDI) grown on Ag(111). Time-resolved X-ray photoelectron spectroscopy on such a system reveals light-induced modifications of the ELA; by measuring the transient shift of the core level photoemission lines we observe an accumulation of long-lived holes in the PTCDI within the first hundred picoseconds after the optical pump. |
topic |
organic heterojunction pump–probe photoemission exciton dynamics transient energy level alignment interface dipole |
url |
https://www.mdpi.com/2624-8549/3/3/53 |
work_keys_str_mv |
AT robertocostantini lightinducedchargeaccumulationinptcdipentaceneag111heterojunctions AT albanocossaro lightinducedchargeaccumulationinptcdipentaceneag111heterojunctions AT albertomorgante lightinducedchargeaccumulationinptcdipentaceneag111heterojunctions AT martinadellangela lightinducedchargeaccumulationinptcdipentaceneag111heterojunctions |
_version_ |
1717367695480979456 |