Halbich, Marc-Uwe: Organic selective contacts for crystalline silicon solar cells. Hannover : Gottfried Wilhelm Leibniz Universität, Diss., 2021, VII, 138 S. DOI: https://doi.org/10.15488/10549
Zusammenfassung: | |
The hole-conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonicacid) [PEDOT:PSS] is known to effectively passivate crystalline siliconsurfaces and to simultaneously provide a low contact resistance for holes. PEDOT:PSS can therefore be applied as a hole-selective, passivating contact layerin silicon solar cells. In this thesis, PEDOT:PSS/c-Si solar cells with phosphorusdiffused front and PEDOT:PSS/c-Si heterojunction at the rear (‘BackPEDOT’ solar cells) are manufactured and the selectivity of PEDOT:PSS on crystalline silicon is examined. On random-pyramid-textured silicon surfaces covered with PEDOT:PSS we observe for the first time an additional thin organic layer, which has an increased sulfur content in comparison to the bulk PEDOT:PSS and which is responsible for the passivation of the silicon surface. The maximum shortcircuit current density increases with decreasing PEDOT:PSS layer thickness. In order to further reduce the parasitic absorption, the impact of additives to thePEDOT:PSS dispersion is investigated. We hereby demonstrate for the first time,that the admixture of sorbitol not only reduces the parasitic absorption in PEDOT:PSS, but also improves the passivation quality of PEDOT:PSS on silicon.A maximum energy conversion efficiency of 20.6% of a BackPEDOT solar cell wasachieved for PEDOT:PSS with sorbitol admixture. This is the highest efficiencyachieved so far for a c-Si solar cell with an organic selective contact. Furthermore,the band bending within the silicon bulk of the PEDOT:PSS/c-Si junctionis examined by a newly introduced methodology based on the Depletion RegionModulation (DRM) effect. For the first time we demonstrate that admixture ofsorbitol to the PEDOT:PSS dispersion improves the chemical interface passivation,but the band bending within the silicon bulk towards the PEDOT:PSS/c-Siinterface remains unaffected. | |
Lizenzbestimmungen: | CC BY 3.0 DE |
Publikationstyp: | DoctoralThesis |
Publikationsstatus: | publishedVersion |
Erstveröffentlichung: | 2021 |
Die Publikation erscheint in Sammlung(en): | Fakultät für Mathematik und Physik Dissertationen |
Pos. | Land | Downloads | ||
---|---|---|---|---|
Anzahl | Proz. | |||
1 | Germany | 146 | 52,90% | |
2 | China | 51 | 18,48% | |
3 | United States | 23 | 8,33% | |
4 | France | 11 | 3,99% | |
5 | Iraq | 8 | 2,90% | |
6 | Hong Kong | 5 | 1,81% | |
7 | Turkey | 4 | 1,45% | |
8 | Spain | 4 | 1,45% | |
9 | No geo information available | 3 | 1,09% | |
10 | Australia | 3 | 1,09% | |
andere | 18 | 6,52% |
Hinweis
Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.