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Extending the environmental lifetime of unpackaged perovskite solar cells through interfacial design

Haiwei Chen ; Yi Hou ; Christian E. Halbig ; Shi Chen ; Hong Zhang ; Ning Li ; Fei Guo ; Xiaofeng Tang ; Nicola Gasparini ; Ievgen Levchuk ; Simon Kahmann ; Cesar Omar Ramirez Quiroz ; Andres Osvet ; Siegfried Eigler (Institutionen för kemi och kemiteknik, Organisk kemi) ; Christoph J. Brabec
Journal of Materials Chemistry A (20507488). Vol. 4 (2016), 30, p. 11604-11610.
[Artikel, refereegranskad vetenskaplig]

Solution-processed oxo-functionalized graphene (oxo-G1) is employed to substitute hydrophilic PEDOT:PSS as an anode interfacial layer for perovskite solar cells. The resulting devices exhibit a reasonably high power conversion efficiency (PCE) of 15.2% in the planar inverted architecture with oxo-G1 as a hole transporting material (HTM), and most importantly, deploy the full open-circuit voltage (Voc) of up to 1.1 V. Moreover, oxo-G1 effectively slows down the ingress of water vapor into the device stack resulting in significantly enhanced environmental stability of unpackaged cells under illumination with 80% of the initial PCE being reached after 500 h. Without encapsulation, ∼60% of the initial PCE is retained after ∼1000 h of light soaking under 0.5 sun and ambient conditions maintaining the temperature beneath 30 °C. Moreover, the unsealed perovskite device retains 92% of its initial PCE after about 1900 h under ambient conditions and in the dark. Our results underpin that controlling water diffusion into perovskite cells through advanced interface engineering is a crucial step towards prolonged environmental stability.



Denna post skapades 2016-09-22.
CPL Pubid: 242207

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Organisk kemi

Ämnesområden

Kemi

Chalmers infrastruktur