http://www.cnr.it/ontology/cnr/individuo/prodotto/ID291246
Post-deposition Activation of Latent Hydrogen-Bonding: A New Paradigm for Enhancing the Performances of Bulk Heterojunction Solar Cells (Articolo in rivista)
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- Post-deposition Activation of Latent Hydrogen-Bonding: A New Paradigm for Enhancing the Performances of Bulk Heterojunction Solar Cells (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1002/adfm.201400896 (literal)
- Alternative label
Bruni, Francesco; Sassi, Mauro; Campione, Marcello; Giovanella, Umberto; Ruffo, Riccardo; Luzzati, Silvia; Meinardi, Francesco; Beverina, Luca; Brovelli, Sergio (2014)
Post-deposition Activation of Latent Hydrogen-Bonding: A New Paradigm for Enhancing the Performances of Bulk Heterojunction Solar Cells
in Advanced functional materials (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Bruni, Francesco; Sassi, Mauro; Campione, Marcello; Giovanella, Umberto; Ruffo, Riccardo; Luzzati, Silvia; Meinardi, Francesco; Beverina, Luca; Brovelli, Sergio (literal)
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- Dipartimento di Scienza dei Materiali Università degli Studi di Milano-Bicocca via Cozzi 55 20125 Milano Italy; Dipartimento di Scienze dell'Ambiente e del Territorio e di Scienze della Terra Università degli Studi di Milano-Bicocca Piazza della Scienza 1 20126 Milano Italy; Istituto per lo Studio delle Macromolecole Consiglio Nazionale delle Ricerche (ISMac-CNR) Via Bassini 15 20133 Milano Italy (literal)
- Titolo
- Post-deposition Activation of Latent Hydrogen-Bonding: A New Paradigm for Enhancing the Performances of Bulk Heterojunction Solar Cells (literal)
- Abstract
- Small conjugated molecules (SM) are gaining momentum as an alternative to semiconducting polymers for the production of solution-processed bulk heterojunction (BHJ) solar cells. The major issue with SM-BHJs is the low carrier mobility due to the scarce control on the phase-segregation process and consequent lack of preferential percolative pathways for electrons and holes to the extraction electrodes. Here, a new paradigm for fine tuning the phase-segregation in SM-BHJs, based on the post-deposition exploitation of latent hydrogen bonding in binary mixtures of PCBM with suitably functionalized electron donor molecules, is demonstrated. The strategy consist in the chemical protection of the H-bond forming sites of the donor species with a thermo-labile functionality whose controlled thermal cleavage leads to the formation of stable, crystalline, phase-separated molecular aggregates. This approach allows the fine tuning of the nanoscale film connectivity and thereby to simultaneously optimize the generation of geminate carriers at the donor-acceptor interfaces and the extraction of free charges via ordered phase-separated domains. As a result, the PV efficiency undergoes an over twenty-fold increase with respect to control devices. This strategy, demonstrated here with mixtures of diketopyrrolopyrrole derivatives with PCBM can be extended to other molecular systems for achieving highly efficient SM-BHJ solar cells. (literal)
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