Integration of a functionalized graphene nano-network into a planar perovskite absorber for high-efficiency large-area solar cells

Yong Wang, Yuanyuan Zhou, Taiyang Zhang, Ming Gang Ju, Lin Zhang, Miao Kan, Yihui Li, Xiao Cheng Zeng, Nitin P. Padture, Yixin Zhao

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Efficient charge collection is critical in large area (quasi-) planar configuration perovskite solar cells (PSCs) as the cell operation relies on the diffusion of photo-generated charge carriers to charge collector layers. Many defects/traps in the polycrystalline perovskite absorber layer strongly affect the charge collection efficiency because the 2D-like top charge collection layer barely penetrates into the 3D grain boundaries in the perovskite layer to efficiently collect the charge carrier. Inspired by blood capillaries for efficient mass exchange, a charge-collection nano-network for efficient charge collection was incorporated into the perovskite absorber using low-cost, stable amino-functionalized graphene (G-NH2). The integration of such an unprecedented structure enables very efficient charge collection, leading to the significant enhancement of the power conversion efficiency of 1 × 1 cm2 MAPbI3 PSCs from 14.4 to 18.7% with higher reproducibility, smaller hysteresis and enhanced stability. The physicochemical mechanisms underlying the role of this nano charge-collection nano-network in boosting the charge collection in PSCs are elucidated comprehensively, using a combined experimental and theoretical approach, pointing to a new direction towards up-scaling of high-efficiency PSCs.

Original languageEnglish (US)
Pages (from-to)868-873
Number of pages6
JournalMaterials Horizons
Volume5
Issue number5
DOIs
StatePublished - Sep 2018

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Perovskite
Graphene
Solar cells
Charge carriers
Conversion efficiency
Hysteresis
Grain boundaries
Blood
Defects
Perovskite solar cells
perovskite
Costs

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Process Chemistry and Technology
  • Electrical and Electronic Engineering

Cite this

Integration of a functionalized graphene nano-network into a planar perovskite absorber for high-efficiency large-area solar cells. / Wang, Yong; Zhou, Yuanyuan; Zhang, Taiyang; Ju, Ming Gang; Zhang, Lin; Kan, Miao; Li, Yihui; Zeng, Xiao Cheng; Padture, Nitin P.; Zhao, Yixin.

In: Materials Horizons, Vol. 5, No. 5, 09.2018, p. 868-873.

Research output: Contribution to journalArticle

Wang, Yong ; Zhou, Yuanyuan ; Zhang, Taiyang ; Ju, Ming Gang ; Zhang, Lin ; Kan, Miao ; Li, Yihui ; Zeng, Xiao Cheng ; Padture, Nitin P. ; Zhao, Yixin. / Integration of a functionalized graphene nano-network into a planar perovskite absorber for high-efficiency large-area solar cells. In: Materials Horizons. 2018 ; Vol. 5, No. 5. pp. 868-873.
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