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Title: Effects of potassium treatment on SnO2 electron transport layers for improvements of perovskite solar cells

Journal Article · · Solar Energy
 [1];  [2];  [2];  [2];  [3];  [2];  [3]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States); Incheon National Univ. (Korea, Republic of)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Incheon National Univ. (Korea, Republic of)
+ Show Author Affiliations

SnO2 has been studied intensively as an electron transport layer (ETL) for highly efficient metal halide perovskite solar cells. However, SnO2 ETL frequently exhibits defect-related issues associated with the bulk SnO2 and the perovskite/SnO2 interface, and to passivate the defect states potassium ion has been used. In order to investigate the passivation effect of potassium ion, we carried out KCl treatment on the solution-processed SnO2 ETL. It was found that KCl-treatment shifted up conduction band maximum and Fermi energy of SnO2, and reduced the band gap of perovskite absorber by K+ diffusion, which resulted in a better conduction band alignment at perovskite/SnO2. Admittance spectroscopy revealed that diffused K+ ions can passivate defects of the perovskite absorber layer. With the improvement of band alignment and defect passivation via the KCl treatment, the J-V hysteresis was almost eliminated and power conversion efficiency was much enhanced with improved open-circuit voltage and fill factor.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1845690
Report Number(s):
NREL/JA--5900-81964; MainId:82737; UUID:9f0a6a87-cf8c-4bbe-9dab-729a4ad4f9b0; MainAdminID:63859
Journal Information:
Solar Energy, Journal Name: Solar Energy Vol. 233; ISSN 0038-092X
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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  • The Journal of Physical Chemistry Letters, Vol. 5, Issue 4, p. 680-685 https://doi.org/10.1021/jz500059v
journal January 2014
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Boosting the performance of perovskite solar cells through a novel active passivation method journal January 2018

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14 SOLAR ENERGY
K treatment
SnO2
defect passivation
electron transport layer
perovskite solar cell