Carbon dangling bonds in photodegraded polymer:fullerene solar cells (Conference Presentation)

Fadzai Fungura; William Robin Lindemann; Joseph Shinar; Ruth Shinar

doi:10.1117/12.2275054

19 September 2017 Carbon dangling bonds in photodegraded polymer:fullerene solar cells (Conference Presentation)

Fadzai Fungura, William Robin Lindemann, Joseph Shinar, Ruth Shinar

Proceedings Volume 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII; 103631B (2017) https://doi.org/10.1117/12.2275054
Event: SPIE Organic Photonics + Electronics, 2017, San Diego, California, United States

Abstract

Intrinsic photodegradation of organic solar cells, theoretically attributed to C-H bond rearrangement/breaking, remains a key commercialization barrier. This work presents, via dark electron paramagnetic resonance (EPR), the first experimental evidence for metastable C dangling bonds (DBs) formed by blue/UV irradiation of polymer:fullerene blend films in nitrogen. The DB density increased with irradiation and decreased ~4 fold after 2 weeks in the dark. The dark EPR also shows increased densities of other spin-active sites in photodegraded polymer, fullerene, and polymer:fullerene blend films, consistent with broad electronic measurements of fundamental properties, including defect/gap state densities. The EPR and electronic measurements enable identification of defect states, whether in the polymer, fullerene, or at the donor/acceptor (D/A) interface. Importantly, the EPR results indicate that the DBs are at the D/A interface, as they were present only in the blend films. The role of polarons in interface DB formation will also be discussed.

Conference Presentation

Citation Download Citation

Fadzai Fungura, William Robin Lindemann, Joseph Shinar, and Ruth Shinar "Carbon dangling bonds in photodegraded polymer:fullerene solar cells (Conference Presentation)", Proc. SPIE 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII, 103631B (19 September 2017); https://doi.org/10.1117/12.2275054

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KEYWORDS

Polymers

Polymer thin films

Carbon

Dubnium

Fullerenes

Heterojunctions

Solar cells

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