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 language | English |
|---|---|
| Journal | ACS Applied Materials and Interfaces |
| DOIs | |
| Publication status | Published - Jan 1 2019 |
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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 journal › Article
}
TY - JOUR
T1 - Low-Frequency Carrier Kinetics in Perovskite Solar Cells
AU - Sangwan, Vinod K.
AU - Zhu, Menghua
AU - Clark, Sarah
AU - Luck, Kyle A.
AU - Marks, Tobin J
AU - Kanatzidis, Mercouri G
AU - Hersam, Mark C
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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.
AB - 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.
KW - 1/f noise
KW - degradation
KW - hybrid perovskite solar cells
KW - impedance spectroscopy
KW - methylammonium lead iodide
KW - mobile ions
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U2 - 10.1021/acsami.9b03884
DO - 10.1021/acsami.9b03884
M3 - Article
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
ER -