Dual Interfacial Design for Efficient CsPbI2Br Perovskite Solar Cells with Improved Photostability

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Tian J, Xue Q, Tang X, Chen Y, Li N, Hu Z, Shi T, Wang X, Huang F, Brabec C, Yip HL, Cao Y
Zeitschrift: Advanced Materials
Jahr der Veröffentlichung: 2019
Seitenbereich: e1901152
ISSN: 0935-9648
Sprache: Englisch


Abstract

A synergic interface design is demonstrated for photostable inorganic mixed‐halide perovskite solar cells (PVSCs) by applying an amino‐functionalized polymer (PN4N) as cathode interlayer and a dopant‐free hole‐transporting polymer poly[5,5′‐bis(2‐butyloctyl)‐(2,2′‐bithiophene)‐4,4′‐dicarboxylate‐alt‐5,5′‐2,2′‐bithiophene] (PDCBT) as anode interlayer. First, the interfacial dipole formed at the cathode interface reduces the workfunction of SnO2, while PDCBT with deeper‐lying highest occupied molecular orbital (HOMO) level provides a better energy‐level matching at the anode, leading to a significant enhancement in open‐circuit voltage (Voc) of the PVSCs. Second, the PN4N layer can also tune the surface wetting property to promote the growth of high‐quality all‐inorganic perovskite films with larger grain size and higher crystallinity. Most importantly, both theoretical and experimental results reveal that PN4N and PDCBT can interact strongly with the perovskite crystal, which effectively passivates the electronic surface trap states and suppresses the photoinduced halide segregation of CsPbI2Br films. Therefore, the optimized CsPbI2Br PVSCs exhibit reduced interfacial recombination with efficiency over 16%, which is one of the highest efficiencies reported for all‐inorganic PVSCs. A high photostability with a less than 10% efficiency drop is demonstrated for the CsPbI2Br PVSCs with dual interfacial modifications under continuous 1 sun equivalent illumination for 400 h.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Brabec, Christoph Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Materialien der Elektronik und der Energietechnologie)
Li, Ning Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Materialien der Elektronik und der Energietechnologie)
Tang, Xiaofeng
Lehrstuhl für Werkstoffwissenschaften (Materialien der Elektronik und der Energietechnologie)


Einrichtungen weiterer Autorinnen und Autoren

Jinan University
Lawrence Berkeley National Laboratory (LBNL)
South China Normal University / 华南师范大学


Forschungsbereiche

Neue Materialien und Prozesse
Forschungsschwerpunkt einer Fakultät: Technische Fakultät


Zitierweisen

APA:
Tian, J., Xue, Q., Tang, X., Chen, Y., Li, N., Hu, Z.,... Cao, Y. (2019). Dual Interfacial Design for Efficient CsPbI2Br Perovskite Solar Cells with Improved Photostability. Advanced Materials, e1901152. https://dx.doi.org/10.1002/adma.201901152

MLA:
Tian, Jingjing, et al. "Dual Interfacial Design for Efficient CsPbI2Br Perovskite Solar Cells with Improved Photostability." Advanced Materials (2019): e1901152.

BibTeX: 

Zuletzt aktualisiert 2019-15-07 um 16:54