Intrinsic non-radiative voltage losses in fullerene-based organic solar cells
Organic solar cells demonstrate external quantum efficiencies and fill factors approaching those of conventional photovoltaic technologies. However, as compared with the optical gap of the absorber materials, their open-circuit voltage is much lower, largely due to the presence of significant non-ra...
| Những tác giả chính: | , , , , |
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| Định dạng: | Journal article |
| Được phát hành: |
Springer Nature
2017
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| _version_ | 1826272874586963968 |
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| author | Benduhn, J Tvingstedt, K Piersimoni, F Tropiano, M Riede, M |
| author_facet | Benduhn, J Tvingstedt, K Piersimoni, F Tropiano, M Riede, M |
| author_sort | Benduhn, J |
| collection | OXFORD |
| description | Organic solar cells demonstrate external quantum efficiencies and fill factors approaching those of conventional photovoltaic technologies. However, as compared with the optical gap of the absorber materials, their open-circuit voltage is much lower, largely due to the presence of significant non-radiative recombination. Here, we study a large data set of published and new material combinations and find that non-radiative voltage losses decrease with increasing charge-transfer-state energies. This observation is explained by considering non-radiative charge-transfer-state decay as electron transfer in the Marcus inverted regime, being facilitated by a common skeletal molecular vibrational mode. Our results suggest an intrinsic link between non-radiative voltage losses and electron-vibration coupling, indicating that these losses are unavoidable. Accordingly, the theoretical upper limit for the power conversion efficiency of single-junction organic solar cells would be reduced to about 25.5% and the optimal optical gap increases to 1.45–1.65 eV, that is, 0.2–0.3 eV higher than for technologies with minimized non-radiative voltage losses. |
| first_indexed | 2024-03-06T22:19:28Z |
| format | Journal article |
| id | oxford-uuid:5489c16b-d6d8-4ed1-bc1e-e4fa6bc12788 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T22:19:28Z |
| publishDate | 2017 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | oxford-uuid:5489c16b-d6d8-4ed1-bc1e-e4fa6bc127882022-03-26T16:38:27ZIntrinsic non-radiative voltage losses in fullerene-based organic solar cellsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5489c16b-d6d8-4ed1-bc1e-e4fa6bc12788Symplectic Elements at OxfordSpringer Nature2017Benduhn, JTvingstedt, KPiersimoni, FTropiano, MRiede, MOrganic solar cells demonstrate external quantum efficiencies and fill factors approaching those of conventional photovoltaic technologies. However, as compared with the optical gap of the absorber materials, their open-circuit voltage is much lower, largely due to the presence of significant non-radiative recombination. Here, we study a large data set of published and new material combinations and find that non-radiative voltage losses decrease with increasing charge-transfer-state energies. This observation is explained by considering non-radiative charge-transfer-state decay as electron transfer in the Marcus inverted regime, being facilitated by a common skeletal molecular vibrational mode. Our results suggest an intrinsic link between non-radiative voltage losses and electron-vibration coupling, indicating that these losses are unavoidable. Accordingly, the theoretical upper limit for the power conversion efficiency of single-junction organic solar cells would be reduced to about 25.5% and the optimal optical gap increases to 1.45–1.65 eV, that is, 0.2–0.3 eV higher than for technologies with minimized non-radiative voltage losses. |
| spellingShingle | Benduhn, J Tvingstedt, K Piersimoni, F Tropiano, M Riede, M Intrinsic non-radiative voltage losses in fullerene-based organic solar cells |
| title | Intrinsic non-radiative voltage losses in fullerene-based organic solar cells |
| title_full | Intrinsic non-radiative voltage losses in fullerene-based organic solar cells |
| title_fullStr | Intrinsic non-radiative voltage losses in fullerene-based organic solar cells |
| title_full_unstemmed | Intrinsic non-radiative voltage losses in fullerene-based organic solar cells |
| title_short | Intrinsic non-radiative voltage losses in fullerene-based organic solar cells |
| title_sort | intrinsic non radiative voltage losses in fullerene based organic solar cells |
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