Nanoscale Morphology of Doctor Bladed versus Spin-Coated Organic Photovoltaic Films

Journal article
(Original article)

Publication Details

Author(s): Pokuri BSS, Sit J, Wodo O, Baran D, Ameri T, Brabec C, Moule AJ, Ganapathysubramanian B
Journal: Advanced Energy Materials
Publication year: 2017
Pages range: 1701269--n/a
ISSN: 1614-6832
eISSN: 1614-6840
Language: English


Recent advances in efficiency of organic photovoltaics are driven by judicious

selection of processing conditions that result in a “desired” morphology.

An important theme of morphology research is quantifying the effect of

processing conditions on morphology and relating it to device efficiency.

State-of-the-art morphology quantification methods provide film-averaged or

2D-projected features that only indirectly correlate with performance, making

causal reasoning nontrivial. Accessing the 3D distribution of material, however,

provides a means of directly mapping processing to performance. In this

paper, two recently developed techniques are integrated—reconstruction of

3D morphology and subsequent conversion into intuitive morphology descriptors

—to comprehensively image and quantify morphology. These techniques

are applied on films generated by doctor blading and spin coating, additionally

investigating the effect of thermal annealing. It is found that morphology

of all samples exhibits very high connectivity to electrodes. Not surprisingly,

thermal annealing consistently increases the average domain size in the

samples, aiding exciton generation. Furthermore, annealing also improves

the balance of interfaces, enhancing exciton dissociation. A comparison of

morphology descriptors impacting each stage of photophysics (exciton generation,

dissociation, and charge transport) reveals that spin-annealed sample

exhibits superior morphology-based performance indicators. This suggests

substantial room for improvement of blade-based methods (process optimization)

for morphology tuning to enhance performance of large area devices.

FAU Authors / FAU Editors

Ameri, Tayebeh Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)

External institutions with authors

Iowa State University of Science and Technology (ISU)
King Abdullah University of Science and Technology (KAUST) / جامعة الملك عبد الله للعلوم و التقنية
University at Buffalo. State University of New York
University of California Davis (UCDAVIS)

Research Fields

Neue Materialien und Prozesse
Research focus area of a faculty: Technische Fakultät

How to cite

Pokuri, B.S.S., Sit, J., Wodo, O., Baran, D., Ameri, T., Brabec, C.,... Ganapathysubramanian, B. (2017). Nanoscale Morphology of Doctor Bladed versus Spin-Coated Organic Photovoltaic Films. Advanced Energy Materials, 1701269--n/a.

Pokuri, Balaji Sesha Sarath, et al. "Nanoscale Morphology of Doctor Bladed versus Spin-Coated Organic Photovoltaic Films." Advanced Energy Materials (2017): 1701269--n/a.


Last updated on 2019-11-07 at 09:18

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