Charge-transfer states in DBP-C70 organic solar cells:sensitive external quantum efficiency (sEQE) and morphological studies

Golnaz Sherafatipour

Research output: Contribution to conference without publisher/journalPosterResearchpeer-review

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Abstract

Organic photovoltaic (OPV) is an emerging economically competitive photovoltaic technology that has advantages over conventional inorganic PV technology including low fabrication cost, lightweight, semi-transparency and mechanical flexibility1. Despite these advantages, OPVs have comparably low power conversion efficiencies and rather short lifetimes, which are the most critical factors hampering their application. In order to overcome these barriers and close the gap between laboratory achievements and industrial scale requirements, a detailed understanding of the device degradation mechanism is required. Charge transfer (CT) states, representing intermediate states between exciton dissociation and recombination at donor-acceptor interface, play hereby a crucial role. In this work, we study CT states in DBP-C70 based organic solar cells as a less studied case for inverted and conventional structures. Results from sensitive external quantum efficiency (sEQE) measurements show an unexpected difference in charge transfer state energies for each of the two common structures. Moreover, we observe different values for the reorganization energy, which determines the energy loss upon deformation of the molecule during charging. These results suggest morphological sensitivity of the D-A interface, depending on the deposition sequence, which is investigated amongst others by means of atomic force microscopy studies. These investigations are followed by aging the devices and detecting the probable changes in the previously obtained parameters.
Original languageEnglish
Publication dateNov 2016
Publication statusPublished - Nov 2016
EventInternational Summit on OPV Stability - Konzerthaus Freiburg, Freiburg, Germany
Duration: 12. Oct 201614. Oct 2016
Conference number: 9
https://isos9.ise.fraunhofer.de/

Conference

ConferenceInternational Summit on OPV Stability
Number9
LocationKonzerthaus Freiburg
CountryGermany
CityFreiburg
Period12/10/201614/10/2016
Internet address

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quantum efficiency
solar cells
charge transfer
charging
emerging
energy dissipation
excitons
atomic force microscopy
dissociation
degradation
costs
life (durability)
requirements
fabrication
energy
sensitivity
molecules

Cite this

Sherafatipour, G. (2016). Charge-transfer states in DBP-C70 organic solar cells:sensitive external quantum efficiency (sEQE) and morphological studies. Poster session presented at International Summit on OPV Stability, Freiburg, Germany.
Sherafatipour, Golnaz. / Charge-transfer states in DBP-C70 organic solar cells:sensitive external quantum efficiency (sEQE) and morphological studies. Poster session presented at International Summit on OPV Stability, Freiburg, Germany.
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Sherafatipour, G 2016, 'Charge-transfer states in DBP-C70 organic solar cells:sensitive external quantum efficiency (sEQE) and morphological studies', International Summit on OPV Stability, Freiburg, Germany, 12/10/2016 - 14/10/2016.

Charge-transfer states in DBP-C70 organic solar cells:sensitive external quantum efficiency (sEQE) and morphological studies. / Sherafatipour, Golnaz.

2016. Poster session presented at International Summit on OPV Stability, Freiburg, Germany.

Research output: Contribution to conference without publisher/journalPosterResearchpeer-review

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AB - Organic photovoltaic (OPV) is an emerging economically competitive photovoltaic technology that has advantages over conventional inorganic PV technology including low fabrication cost, lightweight, semi-transparency and mechanical flexibility1. Despite these advantages, OPVs have comparably low power conversion efficiencies and rather short lifetimes, which are the most critical factors hampering their application. In order to overcome these barriers and close the gap between laboratory achievements and industrial scale requirements, a detailed understanding of the device degradation mechanism is required. Charge transfer (CT) states, representing intermediate states between exciton dissociation and recombination at donor-acceptor interface, play hereby a crucial role. In this work, we study CT states in DBP-C70 based organic solar cells as a less studied case for inverted and conventional structures. Results from sensitive external quantum efficiency (sEQE) measurements show an unexpected difference in charge transfer state energies for each of the two common structures. Moreover, we observe different values for the reorganization energy, which determines the energy loss upon deformation of the molecule during charging. These results suggest morphological sensitivity of the D-A interface, depending on the deposition sequence, which is investigated amongst others by means of atomic force microscopy studies. These investigations are followed by aging the devices and detecting the probable changes in the previously obtained parameters.

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Sherafatipour G. Charge-transfer states in DBP-C70 organic solar cells:sensitive external quantum efficiency (sEQE) and morphological studies. 2016. Poster session presented at International Summit on OPV Stability, Freiburg, Germany.