The role of spin in the degradation of organic photovoltaics.

Abstract:

:Stability is now a critical factor in the commercialization of organic photovoltaic (OPV) devices. Both extrinsic stability to oxygen and water and intrinsic stability to light and heat in inert conditions must be achieved. Triplet states are known to be problematic in both cases, leading to singlet oxygen production or fullerene dimerization. The latter is thought to proceed from unquenched singlet excitons that have undergone intersystem crossing (ISC). Instead, we show that in bulk heterojunction (BHJ) solar cells the photo-degradation of C60 via photo-oligomerization occurs primarily via back-hole transfer (BHT) from a charge-transfer state to a C60 excited triplet state. We demonstrate this to be the principal pathway from a combination of steady-state optoelectronic measurements, time-resolved electron paramagnetic resonance, and temperature-dependent transient absorption spectroscopy on model systems. BHT is a much more serious concern than ISC because it cannot be mitigated by improved exciton quenching, obtained for example by a finer BHJ morphology. As BHT is not specific to fullerenes, our results suggest that the role of electron and hole back transfer in the degradation of BHJs should also be carefully considered when designing stable OPV devices.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ramirez I,Privitera A,Karuthedath S,Jungbluth A,Benduhn J,Sperlich A,Spoltore D,Vandewal K,Laquai F,Riede M

doi

10.1038/s41467-020-20601-6

subject

Has Abstract

pub_date

2021-01-20 00:00:00

pages

471

issue

1

issn

2041-1723

pii

10.1038/s41467-020-20601-6

journal_volume

12

pub_type

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