Low-Frequency Carrier Kinetics in Perovskite Solar Cells

Vinod K. Sangwan, Menghua Zhu, Sarah Clark, Kyle A. Luck, Tobin J Marks, Mercouri G Kanatzidis, Mark C Hersam

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Hybrid organic-inorganic halide perovskite solar cells have emerged as leading candidates for third-generation photovoltaic technology. Despite the rapid improvement in power conversion efficiency (PCE) for perovskite solar cells in recent years, the low-frequency carrier kinetics that underlie practical roadblocks such as hysteresis and degradation remain relatively poorly understood. In an effort to bridge this knowledge gap, we perform here correlated low-frequency noise (LFN) and impedance spectroscopy (IS) characterization that elucidates carrier kinetics in operating perovskite solar cells. Specifically, we focus on planar cell geometries with a SnO 2 electron transport layer and two different hole transport layers - namely, poly(triarylamine) (PTAA) and spiro-OMeTAD. PTAA and spiro-OMeTAD cells with moderate PCEs of 5-12% possess a Lorentzian feature at ?200 Hz in LFN measurements that corresponds to a crossover from electrode to dielectric polarization. In comparison, spiro-OMeTAD cells with high PCEs (>15%) show 4 orders of magnitude lower LFN amplitude and are accompanied by a cyclostationary process. Through a systematic study of more than a dozen solar cells, we establish a correlation with noise amplitude, PCE, and fill factor. Overall, this work establishes correlated LFN and IS as an effective methodology for quantifying low-frequency carrier kinetics in perovskite solar cells, thereby providing new physical insights that can rationally guide ongoing efforts to improve device performance, reproducibility, and stability.

Original languageEnglish
JournalACS Applied Materials and Interfaces
DOIs
Publication statusPublished - Jan 1 2019

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Kinetics
Conversion efficiency
Spectroscopy
Hysteresis
Solar cells
Polarization
Degradation
Electrodes
Geometry
Perovskite solar cells
Electron Transport

Keywords

  • 1/f noise
  • degradation
  • hybrid perovskite solar cells
  • impedance spectroscopy
  • methylammonium lead iodide
  • mobile ions

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Low-Frequency Carrier Kinetics in Perovskite Solar Cells. / Sangwan, Vinod K.; Zhu, Menghua; Clark, Sarah; Luck, Kyle A.; Marks, Tobin J; Kanatzidis, Mercouri G; Hersam, Mark C.

In: ACS Applied Materials and Interfaces, 01.01.2019.

Research output: Contribution to journalArticle

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