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Fluoroalkyl-substituted fullerene/perovskite heterojunction for efficient and ambient stable perovskite solar cells

Journal Article · · Nano Energy
 [1];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [2]
  1. Univ. of Washington, Seattle, WA (United States); Harbin Institute of Technology, Harbin (China); University of Washington
  2. Univ. of Washington, Seattle, WA (United States)
  3. Harbin Institute of Technology, Harbin (China)
+ Show Author Affiliations

In this study, we investigate the feasibility of using a fluoroalkyl-substituted fullerene/perovskite heterojunction (f-FPHJ) to realize efficient and ambient stable perovskite solar cells (PVSCs). The hybrid fluoroalkyl-substituted fullerene, DF-C60, is proven to effectively passivate the defects and grain boundaries in the perovskite film to facilitate charge transport/collection in the derived PVSC. Consequently, the f-FPHJ device yielded an enhanced PCE of 18.11%, outperforming that of the pristine CH3NH3PbI3 device (15.67%). More interestingly, the f-FPHJ PVSC showed a decent PCE of 15.14% (under reverse scan) with small hysteresis even without employing a discrete PCBM electron-transporting layer (ETL), in contrast to the pristine PVSC showing a lower PCE of 14.78% (under reverse scan) accompanied with severe hysteresis. This might arise from the preferential distribution of DF-C60 nearby the surface region of the f-FPHJ film due to its low surface energy, which serves the similar function of the PCBM ETL in device to reduce hysteresis. More importantly, benefitting from the hydrophobic nature of DF-C60, the f-FPHJ PVSC shows respectable ambient stability without encapsulation, which can maintain 83% of its initial PCE after being stored in ambient (with a relative humidity of 60 ± 5%) for 1 month.

Research Organization:
University of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF); Office of Naval Research (ONR); Air Force Office of Scientific Research (AFOSR); Boeing-Johnson Foundation; China Scholarship Council
Grant/Contract Number:
EE0006710
OSTI ID:
1343588
Alternate ID(s):
OSTI ID: 22942822
OSTI ID: 1398668
Report Number(s):
DOE-UW-Jen--22; PII: S2211285516304554
Journal Information:
Nano Energy, Journal Name: Nano Energy Journal Issue: C Vol. 30; ISSN 2211-2855
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Highly efficient all-inorganic perovskite solar cells with suppressed non-radiative recombination by a Lewis base journal January 2020

Figures / Tables (8)

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Table 1(p. 23)table Table 1
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Related Subjects

14 SOLAR ENERGY
36 MATERIALS SCIENCE
fluoroalkyl-substituted fullerene
grain boundary
heterojunction
perovskite
stability