Autor(es):
Marques, Nuno ; Jana, Santanu ; Mendes, Manuel J. ; Águas, Hugo ; Martins, Rodrigo ; Panigrahi, Shrabani
Data: 2024
Identificador Persistente: http://hdl.handle.net/10362/169151
Origem: Repositório Institucional da UNL
Projeto/bolsa:
info:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F123502%2F2016/PT;
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0037%2F2020/PT;
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50025%2F2020/PT;
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50025%2F2020/PT;
info:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTM-REF%2F1008%2F2020/PT;
info:eu-repo/grantAgreement/FCT/3599-PPCDT/2022.01610.PTDC/PT;
info:eu-repo/grantAgreement/EC/H2020/787410/EU;
info:eu-repo/grantAgreement/EC/H2020/952169/EU;
Assunto(s): Chemistry(all); Chemical Engineering(all); SDG 7 - Affordable and Clean Energy
Descrição
Publisher Copyright: © 2024 The Royal Society of Chemistry. This work is funded by FCT-MCTES (Fundação para a Ciência e Tecnologia, I. P.) via the postdoctoral grant SFRH/BPD/123502/ 2016, under the projects LA/P/0037/2020, UIDP/50025/2020 and UIDB/50025/2020 of the Associate Laboratory Institute of Nanostructures, Nanomodelling and Nanofabrication—i3N, and by the projects FlexSolar (PTDC/CTM-REF/1008/2020), SpaceFlex (2022.01610.PTDC) and M-ECO2 (Industrial cluster for advanced biofuel production, Ref. C644930471-00000041) co-nanced by PRR - Recovery and Resilience Plan of the European Union (Next Generation EU). This work also received funding from the European Community's H2020 program under the projects DIGISMART (grant agreement no. 787410, ERC-2018-AdG) and SYNERGY (H2020-WIDESPREAD-2020-5, CSA, proposal no. 952169). We acknowledge Jonas Deuermeier and Tomás Calmeiro for their help in XPS and AFM measurements, respectively.
The long-term performance of metal halide perovskite solar cells (PSCs) can be significantly improved by tuning the surface characteristics of the perovskite layers. Herein, low-temperature-processed ethylenediaminetetraacetic acid (EDTA)-complexed SnO2 (E-SnO2) is successfully employed as an electron transport layer (ETL) in PSCs, enhancing the efficiency and stability of the devices. The effects of EDTA treatment on SnO2 are investigated for different concentrations: comparing the solar cells' response with 15%-2.5% SnO2 and E-SnO2 based ETLs, and it was found that 7.5% E-SnO2 provided the best results. The improved surface properties of the perovskite layer on E-SnO2 are attributed to the presence of small amount of PbI2 which contributes to passivate the defects at the grain boundaries and films' surface. However, for the excess PbI2 based devices, photocurrent dropped, which could be attributed to the generation of shallow traps due to excess PbI2. The better alignment between the Fermi level of E-SnO2 and the conduction band of perovskite is another favorable aspect that enables increased open-circuit potential (VOC), from 0.82 V to 1.015 V, yielding a stabilized power conversion efficiency of 15.51%. This complex ETL strategy presented here demonstrates the enormous potential of E-SnO2 as selective contact to enhance the perovskite layer properties and thereby allow stable and high-efficiency PSCs.
