Organic photovoltaics ( OPV ) have achieved efficiencies of over 19% and are moving towards practical applications. However, stability issues remain a major challenge for OPV commercialization. Recently, Alex K.-Y. Jen, Francis R. Lin and others from City University of Hong Kong reported durable organic photovoltaics realized by selective self-assembled monolayers of morphologically stable holes.
When used
[2- ( 3,6- Dichloro -9H- carbazol -9- yl)ethyl ] phosphonic acid ( 3,6-Cl-2PACz ) or [2- ( 4,5- dichloro -9H- carbazole) When a self-assembled monolayer of -9- ethyl ] phosphonic acid ( 4,5-Cl-2PACz ) replaced the traditional hole transport layer PEDOT:PSS , the authors found that the T80 lifetime of PM6:BTP-eC9- based devices could be Improved from about 100 to about 470 and over 800 hours. The power conversion efficiency also increased from 17.29% to 18.17% and 18.67% respectively .
The improved performance and photostability of 4,5-Cl-2PACz- based devices originate from the stable vertical distribution of donor and acceptor components, which reduces energy disorder and thereby mitigates non-radiative recombination losses. The authors further found that the surface of the 4,5 -Cl-2PACz- modified substrate remained stable under long-term illumination, which was due to the improved photostability of 4,5 - Cl-2PACz , thus achieving stable Active layer morphology. The application of 4,5-Cl-2PACz in the PM6:BTP-eC9:L8-BO-F three-component device can achieve an efficiency of 19.05% and a T80 life of more than 1140h .
Yiwen Wang et.al Durable Organic Photovoltaics Enabled by a Morphology-Stabilizing Hole-Selective Self-Assembled Monolayer Adv. Energy Mater. 2023
DOI: 10.1002/aenm.202303354
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