Extending the environmental lifetime of unpackaged perovskite solar cells through interfacial designChen, H., Hou, Y., Halbig, C. E., Chen, S., Zhang, H., Li, N., Guo, F., Tang, X., Gasparini, N., Levchuk, I., Kahmann, S., Quiroz, C. O. R., Osvet, A., Eigler, S. & Brabec, C. J., 2016, In : Journal of Materials Chemistry A. 4, 30, p. 11604-11610 7 p.
Research output: Contribution to journal › Article › Academic › peer-review
Solution-processed oxo-functionalized graphene (oxo-G(1)) 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-G(1) as a hole transporting material (HTM), and most importantly, deploy the full open-circuit voltage (V-oc) of up to 1.1 V. Moreover, oxo-G(1) 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, similar to 60% of the initial PCE is retained after similar to 1000 h of light soaking under 0.5 sun and ambient conditions maintaining the temperature beneath 30 degrees 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.
|Number of pages||7|
|Journal||Journal of Materials Chemistry A|
|Publication status||Published - 2016|
- HOLE-TRANSPORTING LAYER, HIGH-PERFORMANCE, GRAPHENE OXIDE, CH3NH3PBI3 PEROVSKITE, HIGHLY EFFICIENT, STABILITY, INTERLAYER, ELECTRODE, CONDUCTOR, COMPOSITE