Investigating the Influence of Interfacial Contact Properties on Open Circuit Voltages in Organic Photovoltaic Performance: Work Function Versus Selectivity

Ratcliff, Erin L.; Garcia, Andres; Paniagua, Sergio A.; Cowan, Sarah R.; Giordano, Anthony J.; Ginley, David S.; Marder, Seth R.; Berry, Joseph J.; Olson, Dana C.

doi:10.1002/aenm.201200669

Title: Investigating the Influence of Interfacial Contact Properties on Open Circuit Voltages in Organic Photovoltaic Performance: Work Function Versus Selectivity

Journal Article · Wed Feb 06 00:00:00 EST 2013 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201200669· OSTI ID:1382304

Ratcliff, Erin L.; Garcia, Andres; Paniagua, Sergio A.; Cowan, Sarah R.; Giordano, Anthony J.; Ginley, David S.; Marder, Seth R.; Berry, Joseph J.; Olson, Dana C.

The role of work function and thermodynamic selectivity of hole collecting contacts on the origin of open circuit voltage (VOC) in bulk heterojunction organic photovoltaics is examined for poly(N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT) and [6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) solar cells. In the absence of a charge selective, electron blocking contact, systematic variation of the work function of the contact directly dictates the VOC, as defined by the energetic separation between the relative Fermi levels for holes and electrons, with little change in the observed dark saturation current, J₀. Improving the charge selectivity of the contact through an increased barrier to electron injection from the fullerene in the blend into the hole contact results in a decreased reverse saturation current (decreased J₀ and increased shunt resistance, R_SH) and improved V_OC. Based on these observations, we provide a set of contact design criteria for tuning the V_OC in bulk heterojunction organic photovoltaics.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Interface Science: Solar Electric Materials (CISSEM)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: SC0001084

OSTI ID:: 1382304

Journal Information:: Advanced Energy Materials, Vol. 3, Issue 5; Related Information: CISSEM partners with the University of Arizona (lead); Georgia Institute of Technology; National Renewable Energy Laboratory; Princeton University; University of Washington; ISSN 1614-6832

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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