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Crystalline Alloys of Organic Donors and Acceptors Based on TIPS-Pentacene

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [2];  [1];  [3];  [4];  [2];  [3];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Univ. of Texas at El Paso, TX (United States)
  3. Univ. of Kentucky, Lexington, KY (United States)
  4. Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States

Co-crystals of organic semiconductors can provide model systems for the study of fundamental optoelectronic properties and also new functionality. 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS-Pn) and its fluorinated analogue 1,2,3,4,8,9,10,11-octafluoro-bis(triisopropylsilylethynyl)pentacene (F8TIPS-Pn) form crystalline substitutional alloys during bulk crystal growth from solution. Alloys can also be formed by blade casting thin films from solution. The compounds appear to have sufficient geometric similarity to be miscible in all proportions without inducing long-range disorder in the solid state. The offsets of the electronic levels of TIPS-Pn and F8TIPS-Pn in pure form are similar to those found in bulk heterojunction solar cells. UV/vis spectroscopy and density functional theory demonstrate the charge transfer absorption in the alloy crystals corresponds to an excitation across molecular pairs.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Energy Efficient Materials (CEEM)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001009
OSTI ID:
1369752
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 36 Vol. 119; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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