title: Modified Fullerenes for Efficient Electron Transport Layer-Free Perovskite/Fullerene Blend-Based Solar Cells.
abstract: A variety of novel chemically modified fullerenes, showing different electron-accepting capabilities, has been synthesized and used to prepare electron transport layer (ETL)-free solar cells based on perovskite/fullerene blends. In particular, isoxazolino[60] fullerenes are proven to be a good candidate for processing blend films with CH3NH3PbI3and obtaining enhanced power conversion efficiency (PCE) ETL-free perovskite solar cells (PSCs), improving the state-of-the-art PCE (i.e., 14.3 %) for this simplified device architecture. A beneficial effect for pyrazolino and methano[60]fullerene derivatives versus pristine [60]/fullerene is also shown. Furthermore, a clear correlation between the LUMO energy level of the fullerene component and the open circuit voltage of the solar cells is found. Apart from the new knowledge on innovative fullerene derivatives for PSCs, the universality and versatility of perovskite/fullerene blend films to obtain efficient ETL-free PSCs is demonstrated.
authors.affiliation: IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, C/ Faraday 9, 28049, Madrid, Spain.
authors.forename: Rafael
authors.initials: R
authors.lastname: Sandoval-Torrientes
authors.affiliation: IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón 196, 20009, Donostia-San Sebastián, Spain.|POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, 20018, Donostia-San Sebastián, Spain.
authors.forename: Jorge
authors.initials: J
authors.lastname: Pascual
authors.affiliation: IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, C/ Faraday 9, 28049, Madrid, Spain.
authors.forename: Inés
authors.initials: I
authors.lastname: García-Benito
authors.affiliation: POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, 20018, Donostia-San Sebastián, Spain.
authors.forename: Silvia
authors.initials: S
authors.lastname: Collavini
authors.affiliation: IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón 196, 20009, Donostia-San Sebastián, Spain.
authors.forename: Ivet
authors.initials: I
authors.lastname: Kosta
authors.affiliation: IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón 196, 20009, Donostia-San Sebastián, Spain.
authors.forename: Ramón
authors.initials: R
authors.lastname: Tena-Zaera
authors.affiliation: IMDEA Nanociencia, Ciudad Universitaria de Cantoblanco, C/ Faraday 9, 28049, Madrid, Spain.|Departamento de Química Orgánica, Facultad C. C. Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain.
authors.forename: Nazario
authors.initials: N
authors.lastname: Martín
authors.affiliation: POLYMAT, University of the Basque Country UPV/EHU, Avenida de Tolosa 72, 20018, Donostia-San Sebastián, Spain.|Ikerbasque, Basque Foundation for Science, 48013, Bilbao, Spain.
authors.forename: Juan Luis
authors.identifier: 0000-0002-6948-8062
authors.initials: JL
authors.lastname: Delgado
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D011211:Electric Power Supplies; D004583:Electrons; D037741:Fullerenes / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D037741:Fullerenes; D010087:Oxides; C059910:perovskite; D014025:Titanium
keywords: electron-transport layer; fullerenes; perovskite; photovoltaics; solar cells