| Full text | |
| Author(s): |
Lemos, Hugo G. G.
;
Rossato, Jessica H. H.
;
Ramos Jr, Roberto A. A.
;
Lima, Joao V. M.
;
Affonco, Lucas J. J.
;
Trofimov, Sergei
;
Michel, Jose J. I.
;
Fernandes, Silvia L. L.
;
Naydenov, Boris
;
Graeff, Carlos F. O.
Total Authors: 10
|
| Document type: | Journal article |
| Source: | JOURNAL OF MATERIALS CHEMISTRY C; v. N/A, p. 10-pg., 2023-01-31. |
| Abstract | |
Nb2O5 shows promising features for electron transport layers (ETL) in perovskite solar cells (PSCs), such as suitable band alignment and ultraviolet stability. Here, we studied the incorporation of Ti3C2Tx MXene in a solution-processable compact layer as a component of ETLs for PSCs. The addition of 0.4 wt% MXene with respect to niobium ethoxide was shown to enhance the PCE (19.46% for the champion device) and stability (96% of its original PCE after 500 hours) compared to pristine devices. The improved performance of the Nb2O5-Ti3C2 devices (0.4 wt%) could be attributed to the adapted alignment of the energy band between perovskite and ETL layers, which favors electron transport and extraction. In addition, the high electrical conductivity of MXenes worked as a free pathway for the extracted electrons preventing charge recombination. These features were corroborated by Photo-CELIV, which showed a higher density of extracted charges and increased charge carrier lifetime for Nb2O5-Ti3C2 based devices. Hence, the results unveiled in this work indicate that MXenes are promising 2D materials for tuning Nb2O5 based ETLs. Future works shall focus on other MXene compounds to further boost PSC performance and stability. (AU) | |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 20/12356-8 - Stability optimization of perovskite solar cells |
| Grantee: | Carlos Frederico de Oliveira Graeff |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 20/16470-0 - Development of nanocomposites based on MXenes and intrinsically conducting polymers for HTL of perovskite solar cells |
| Grantee: | Hugo Gajardoni de Lemos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 21/03379-7 - Application of New Materials as Electrodes in Flexible Supercapacitors |
| Grantee: | João Victor Morais Lima |
| Support Opportunities: | Scholarships in Brazil - Doctorate |