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Effect of Interlayer on Performance of Perovskite Solar Cells under Low Intensity Light
- Alternative Title
- Myung hyun ann
- Author(s)
- 안명현
- Alternative Author(s)
- Myung hyun ann
- Advisor
- 김종현
- Department
- 일반대학원 분자과학기술학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2020-02
- Language
- eng
- Keyword
- IndoorSolarCell; Perovskite
- Alternative Abstract
- In this paper, we report the operation principle of high-power perovskite solar cells (PSCs) for the applications that can be developed in low-intensity indoor lighting with a focus on electron transport layers (ETL) and perovskite layers in the device structure. Surprisingly, we found in the power generation mechanism of the PSC, which found that the power generation mechanism of the PSC under low intensity LEDs and halogen lighting differed from 1 Sun standard test conditions (STC). PSCs based on mesoporous-TiO2 (m-TiO2) under STC have higher power conversion efficiency (PCE) than other PSCs, but at low intensity (below 1600 lux), c-TiO2 PSCs have higher power than m-TiO2 generate. This interesting result indicates that the high PCE of the STC cannot be thought of as stable and high-power output of the PSC at low intensity condition. We systematically analyze the ideality factor, trap density and charge-separation for the characterization of charge recombination, and charge traps or defects occurring at the interface in the electron transport layer / perovskite affect the power generation under low light intensity. Suns-VOC measurements through local ideality factor analysis have demonstrated that trap states at the interface exhibit non-ideal behavior depending on the structure of the PSC under low-intensity light conditions. This is because there is an additional trap state present at the m-TiO2 / Perovskite interface. Kelvin Probe Force Microscopy (KPFM) measurements have shown that these traps hinder the efficiency of charge separation at the perovskite grain boundaries as light intensity decreases. Based on these observations, the requirement for high power PSCs under low-intensity indoor lighting is that the excess carrier density must be higher than the interface trap because the electron transport must be effective at the perovskite grain boundaries. Thus, based on the results, we used organic ETLs with up to 12.36 (56.43), 28.03 (100.97), 63.79 (187.67) and 147.74 (376.85) μW/cm2 at 200, 400, 800 and 1600lux when organic ETL(PCBM) was applied to perovskite. This result is the highest value among indoor low intensity illuminated solar cells in Lux LED (halogen) light.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Molecular Science and Technology > 3. Theses(Master)
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