Solvent additive effects on small molecule crystallization in bulk heterojunction solar cells probed during spin casting

Louis A Perez; Kang Wei Chou; John A Love; Thomas S van der Poll; Detlef-M Smilgies; Thuc-Quyen Nguyen; Edward J Kramer; Aram Amassian; Guillermo C Bazan

doi:10.1002/adma.201302389

Solvent additive effects on small molecule crystallization in bulk heterojunction solar cells probed during spin casting

Adv Mater. 2013 Nov 26;25(44):6380-4. doi: 10.1002/adma.201302389. Epub 2013 Sep 4.

Authors

Louis A Perez¹, Kang Wei Chou, John A Love, Thomas S van der Poll, Detlef-M Smilgies, Thuc-Quyen Nguyen, Edward J Kramer, Aram Amassian, Guillermo C Bazan

Affiliation

¹ Department of Materials, University of California, Santa Barbara, CA, 93106, USA.

PMID: 24002890
DOI: 10.1002/adma.201302389

Abstract

Solvent additive processing can lead to drastic improvements in the power conversion efficiency (PCE) in solution processable small molecule (SPSM) bulk heterojunction solar cells. In situ grazing incidence wide-angle X-ray scattering is used to investigate the kinetics of crystallite formation during and shortly after spin casting. The additive is shown to have a complex effect on structural evolution invoking polymorphism and enhanced crystalline quality of the donor SPSM.

Keywords: bulk heterojunction (BHJ) solar cells; organic photovoltaics (OPV); solution processable small molecules; solvent additive processing; thin film morphology.

Publication types

Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Crystallization
Glass / chemistry
Polystyrenes / chemistry
Solar Energy*
Solvents / chemistry*
Thiophenes / chemistry
Tin Compounds / chemistry

Substances

Polystyrenes
Solvents
Thiophenes
Tin Compounds
poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)
indium tin oxide