2026-06-29T02:34:22Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1241632025-09-19T23:48:36Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Adel, Rana author Gala Sánchez, Elena author Alonso Navarro, Matías J. author Gutiérrez Fernández, Edgar author Martín, Jaime author Stella, Marco author Martínez Ferrero, Eugenia author de la Peña, Alejandro author Harbuzaru, Alexandra author Ramos, M. Mar author Ponce Ortiz, Rocío author Segura Castedo, José Luis author Campoy Quiles, Mariano author 2021-01-07 While it is widely recognized that microstructure plays an important role in the performance of organic photovoltaics (OPV), systematic studies are often challenging, as varying the molecular packing through typical chemical means (such as sidechain tuning) often affects the molecular energy levels, thus preventing a clear correlation. In this work we present the synthesis of three perylene imide (PI) based electron acceptors with almost identical energy levels, but distinct packing tendencies. We confirm our initial hypothesis by measuring solution and solid-state absorption, cyclic voltammetry as well as characterizing the films by grazing incident wide angle X-ray scattering (GIWAXS). In a second step, we repeat the characterization of the three materials in blends with two polymer donors, namely PCDTBT or PBDBT, whose energy levels are well aligned with those of the PI acceptors, and which, additionally, exhibit different degrees of structural order. We show how the initial strong difference between acceptors is partially blurred in blends, but still critical. Finally, we correlate our structural data with OPV devices made with the corresponding six blends. Our data suggest that a good donor acceptor marriage should ensure good energy alignment but also exhibit complementary crystallization tendencies of the two components. Adel, Rana, et al. «Comparing the Microstructure and Photovoltaic Performance of 3 Perylene Imide Acceptors with Similar Energy Levels but Different Packing Tendencies». Journal of Materials Chemistry C, vol. 10, n.o 5, 2022, pp. 1698-710. DOI.org (Crossref), https://doi.org/10.1039/D1TC05037K. 10.1039/d1tc05037k https://hdl.handle.net/20.500.14352/124163 https://pubs.rsc.org/en/content/articlelanding/2022/tc/d1tc05037k Comparing the microstructure and photovoltaic performance of 3 perylene imide acceptors with similar energy levels but different packing tendencies