Multichromophoric energy sensitization of C60 for organic photovoltaics

Journal Article · Fri Sep 19 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4896502· OSTI ID:1369893

Bartynski, Andrew N. ^[1]; Trinh, Cong ^[1]; Kirlikovali, Kent O. ^[1]; Thompson, Mark E. ^[1]

---

1. Univ. of Southern California, Los Angeles, CA (United States)

In organic photovoltaics (OPVs), photocurrent generation is limited by absorption and exciton diffusion in the active layer. In this work, we describe the energy sensitization of C₆₀ simultaneously by two chromophores at high volume concentrations (50%). This sensitization strategy takes advantage of the intense absorption of the sensitizers and the exceptional electron conduction and exciton diffusion length of C₆₀ resulting in a 30% increase in photoresponse of the C₆₀-based sensitized acceptor layer between $$λ$$ = 450 nm and 670 nm and power conversion efficiency under simulated AM 1.5G illumination. In (2,4-bis[4-(N,N-diphenylamino)-2,6- dihydroxyphenyl] squaraine)/C₆₀ devices, sensitization results in an increase in J_SC from 6.5 ± 0.2 mA/cm² to 8.6 ± 0.2 mA/cm² without compromising V_OC or FF. These results demonstrate the robust nature of this sensitization scheme and its broad potential for application in OPVs.

• Research Organization: Energy Frontier Research Centers (EFRC) (United States). Center for Energy Nanoscience (CEN)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0001013
• OSTI ID: 1369893
• Journal Information: Applied Physics Letters, Vol. 105, Issue 11; Related Information: CEN partners with University of Southern California (lead); University of Illinois, Urbana-Champaign; University of Michigan; University of Virginia; ISSN 0003-6951
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
42 ENGINEERING