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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nb2O5 hole blocking layer for hysteresis-free perovskite solar cells

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Fernandes, Silvia L. ; Veron, Anna C. ; Neto, Nilton F. A. ; Nuesch, Frank A. ; Dias da Silva, Jose H. ; Zaghete, Maria A. ; Graeff, Carlos F. de O.
Total Authors: 7
Document type: Journal article
Source: Materials Letters; v. 181, p. 103-107, OCT 15 2016.
Web of Science Citations: 22

Perovskite solar cells have attracted attention due its high conversion efficiency and low cost. In this work, Nb2O5 is used as, an alternative compact hole blocking layer in conjunction with mesoporous TiO2 and CH3NH3PbI3 in perovskite solar cells. The influence of Nb2O5 layer thickness was studied and it was found to strongly influence the J-V hysteresis of the cells. Devices constructed with 50 nm Nb2O5 have small or undetectable hysteresis, which becomes detectable and increases with increasing Nb2O5 layer thickness. For the best device, energy conversion efficiency of up to 12%, short-circuit currents of 17 mA/cm2 and fill factors of 74% were found. These parameters are comparable to the best performance of similar devices where the compad layer is TiO2. In addition, the use of Nb2O5 improved the stability of the solar cells under illumination. These improvements are attributed to a better extraction of photo generated electrons in the perovskite layer. (C) 2016 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/23336-7 - Perovskite solar cells based on niobium oxide films
Grantee:Silvia Leticia Fernandes
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 12/07745-9 - Development of hybrid solar cells based on ZnO and Nb2O5 nanostructured films
Grantee:Silvia Leticia Fernandes
Support Opportunities: Scholarships in Brazil - Doctorate
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