Enhanced Photocurrent Density by Spin-Coated NiO Photocathodes for N-Annulated Perylene-Based p-Type Dye-Sensitized Solar Cells
2016 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 8, no 30, 19393-19401 p.Article in journal (Refereed) Published
The low photocurrent density of p-type dye sensitized solar cells (p-DSSCs) has limited the development of high-efficiency tandem cells due to the inadequate light harvesting ability of sensitizers and the low hole mobility of semiconductors. Hereby, two new "push-pull" type organic dyes (PQ-1 and PQ-2) containing N-annulated perylene as electron donor have been synthesized, where the PQ-2-based p-DSSCs show higher photoelectric conversion efficiency (PCE) of 0.316% owing to the higher molar extinction compared to of that PQ-1. Additionally, the photocurrent densities were remarkably increased from 2.20 to 5.85 mA cm(-2) for PQ-1 and 2.45 to 6.69 mA cm(-2) for PQ-2 by spin coated NiO photocathode based-p-DSSCs, respectively. This results are ascribed to the enhancement of hole transport rate, dye loading amounts and transparency of NiO films in comparison to that prepared by screen-printing method. Electrochemical impedance spectroscopy and theoretical calculations studies indicate that the molecular dipole moment approaching closer to the NiO surface shifts the quasi-Fermi level to more positive levels, improving,open-circuit voltage (V-oc). Intensity-modulated photocurrent spectroscopy illustrates that the hole transit time in NiO films prepared in spin-coating is shorter than that prepared by screen-printing method.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 8, no 30, 19393-19401 p.
p-type dye-sensitized solar cells, spin-coated NiO photocathode, N-annulated perylene, quinoxaline, organic sensitizer
IdentifiersURN: urn:nbn:se:kth:diva-193218DOI: 10.1021/acsami.6b04007ISI: 000380968300025PubMedID: 27416960ScopusID: 2-s2.0-84982686556OAI: oai:DiVA.org:kth-193218DiVA: diva2:1034498
QCV 201610122016-10-122016-09-302016-10-12Bibliographically approved