Connecting Scanning Tunneling Spectroscopy to Device Performance for Polymer: Fullerene Organic Solar Cells
2010 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 4, no 3, 1385-1392 p.Article in journal (Refereed) Published
Scanning tunneling microscopy and spectroscopy have been used to measure the local photovoltaic performance of prototypical polymer:fullerene (MDMO-PPV:PCBM) bulk heterojunction films with similar to 10 nm resolution. Fullerene-rich clusters are found to act as sinks, extracting electrons from a shell layer of a homogeneously mixed polymer:fullerene matrix, surrounding the fullerene cluster. The experimental results were quantitatively modeled with a drift-diffusion model that in first order accounts for the specific morphology. The same model has subsequently been used to calculate performance indicators of macroscopic solar cells as a function of film composition and characteristic size of the phase separation. As such, a first step has been set toward a quantitative correlation between nanoscopic and macroscopic device photovoltaic performance.
Place, publisher, year, edition, pages
American Chemical Society , 2010. Vol. 4, no 3, 1385-1392 p.
organic solar cells; scanning tunneling; microscopy; morphology; device modeling
IdentifiersURN: urn:nbn:se:liu:diva-118176DOI: 10.1021/nn100039rISI: 000275858200018PubMedID: 20184387OAI: oai:DiVA.org:liu-118176DiVA: diva2:813522
Funding Agencies|NanoNed; Ministry of Economic Affairs2015-05-222015-05-222015-06-01