A top-down strategy identifying molecular phase stabilizers to overcome microstructure instabilities in organic solar cells

Journal article
(Original article)


Publication Details

Author(s): Zhang C, Heumüller T, Leon S, Gruber W, Burlafinger K, Tang X, Perea JD, Wabra I, Hirsch A, Unruh T, Li N, Brabec C
Journal: Energy and Environmental Science
Publisher: Royal Society of Chemistry
Publication year: 2019
Volume: 12
Journal issue: 3
Pages range: 1078-1087
ISSN: 1754-5692
Language: English


Abstract

The operational stability of organic solar cells (OSCs) is the essential barrier to commercialization. Compared to thermally-induced degradation, photo-stability of OSCs is far away from being resolved. Here, we demonstrate that the thermal- and photo-degradation of metastable bulk-heterojunction OSCs are governed by the same mechanism. Understanding the fundamental principles behind this mechanism is of significant importance to fully address the instability issues. Structural incompatibilities between the donor and acceptor molecules are identified as the main origin of the instability. Further, we introduce a top-down approach mainly based on their melting temperature and interaction parameters to rationally screen molecular phase stabilizers from a database with more than 10000 small molecules. Eventually, five chemicals were selected to validate our concept and tested in unstable organic solar cells. 1,4-Piperazine, which possesses a high melting point, good miscibility with polymers and the capability of forming inter-molecular hydrogen bonding, can indeed stabilize the mixed amorphous phases, leading to significantly improved stability of otherwise metastable OSCs.


FAU Authors / FAU Editors

Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Burlafinger, Klaus
Institute Materials for Electronics and Energy Technology (i-MEET)
Gruber, Wolfgang Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)
Heumüller, Thomas Dr.-Ing.
Institute Materials for Electronics and Energy Technology (i-MEET)
Hirsch, Andreas Prof. Dr.
Lehrstuhl für Organische Chemie II
Li, Ning Dr.-Ing.
Institute Materials for Electronics and Energy Technology (i-MEET)
Perea Ospina, Jose Dario
Institute Materials for Electronics and Energy Technology (i-MEET)
Tang, Xiaofeng
Institute Materials for Electronics and Energy Technology (i-MEET)
Unruh, Tobias Prof. Dr.
Professur für Nanomaterialcharakterisierung (Streumethoden)
Wabra, Isabell
Lehrstuhl für Organische Chemie II


Additional Organisation
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


External institutions with authors

Southern University of Science and Technology
Universidad Politécnica de Madrid (UPM)


Research Fields

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


How to cite

APA:
Zhang, C., Heumüller, T., Leon, S., Gruber, W., Burlafinger, K., Tang, X.,... Brabec, C. (2019). A top-down strategy identifying molecular phase stabilizers to overcome microstructure instabilities in organic solar cells. Energy and Environmental Science, 12(3), 1078-1087. https://dx.doi.org/10.1039/c8ee03780a

MLA:
Zhang, Chaohong, et al. "A top-down strategy identifying molecular phase stabilizers to overcome microstructure instabilities in organic solar cells." Energy and Environmental Science 12.3 (2019): 1078-1087.

BibTeX: 

Last updated on 2019-27-05 at 17:23