Naphthodithiophene-diketopyrrolopyrrole small molecule donors for efficient solution-processed solar cells

Stephen Loser, Carson J. Bruns, Hiroyuki Miyauchi, Rocío Ponce Ortiz, Antonio Facchetti*, Samuel I. Stupp, Tobin J. Marks

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We report the synthesis, characterization, and implementation of various naphtho[2,3-b:6,7-b′]dithiophene (NDT)-based donor molecules for organic photovoltaics (OPVs). When NDT(TDPP) 2 (TDPP = thiophene-capped diketopyrrolopyrrole) contains all branched 2-ethylhexyl chains and is combined with the electron acceptor PC 61BM, a power conversion efficiency (PCE) of 4.06±0.6% is achieved. This respectable PCE is attributed to the broad, high oscillator strength visible absorption, the ordered molecular packing, and a high hole mobility of 0.04 cm 2·V -1· s-1. We find utilizing linear C-12 side chains on either the TDPP or NDT framework dramatically increases the d-spacing, which directly correlates with inferior OPV device performance. This leads to the conclusion that the selection of an appropriate side chain plays a key role in determining OPV device performance of a small molecule donor.

Original languageEnglish (US)
Title of host publicationOrganic Photovoltaics - Materials to Devices
Number of pages6
StatePublished - 2012
Event2011 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 28 2011Dec 2 2011

Publication series

NameMaterials Research Society Symposium Proceedings
ISSN (Print)0272-9172


Other2011 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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