Solvent engineering of LiTFSI towards high-efficiency planar perovskite solar cells

Zou, Jinjun; Wu, Jihuai; Sun, Weihai; Zhang, Mingjing; Wang, Xiaobing; Yuan, Pengqiang; Zhu, Qianjin; Yin, Jie; Liu, Xuping; Yang, Yuqian

doi:10.1016/j.solener.2019.10.067

Cited by 20 publications

(18 citation statements)

References 39 publications

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“…Figure b shows the UV–vis spectrum obtained after fitting the CGO arrays, which shows a forbidden band width of E g = 3.3618 eV. Subsequently, the valence band maximum ( E VBM = −5.363 eV) was calculated Figure c shows the gradient energy-level arrangement of VBMs formed between the FTO, CGO arrays, and the perovskite active layer.…”

Section: Resultsmentioning

confidence: 99%

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CuGaO₂ Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells

Chen

Qiu

Wang

et al. 2022

ACS Appl. Nano Mater.

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Currently, perovskite solar cells (PSCs) have achieved photoelectric conversion efficiencies (PCEs) comparable to silicon-based and GaAs solar cells. However, PSCs show relatively poor long-term stability, which inhibits their commercialization. Therefore, researchers have turned to inorganic hole-transport materials (HTMs) with more stable chemical properties, such as CuGaO2. It is well known that inorganic HTMs have uneven coverage and show agglomeration in thin films. This study is the first report of growing CuGaO2 nanosheet arrays (CGO arrays) using a simple, low-cost, and reproducible microwave hydrothermal method. This material acts as a hole-transport layer for inverted PSCs, which increases the hole extraction area and efficiency. Remarkably, the devices based on the CGO arrays showed excellent performance in terms of thermal stability and moisture corrosion resistance. After thermal aging in the glovebox for 240 h, the device still maintained more than 78% of the initial efficiency. After 400 h of storage in an environment with a humidity of 50–80%, the device retained more than 83% of its initial efficiency. Consequently, in this study, the CGO arrays were able to reduce the impact of the external factors on the device life of PSCs to maintain an efficient and stable output.

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Section: Resultsmentioning

confidence: 99%

“…Subsequently, the valence band maximum (E VBM = −5.363 eV) was calculated. 40 Figure 3c shows the gradient energy-level arrangement of VBMs formed between the FTO, CGO arrays, and the perovskite active layer. CGO arrays can efficiently collect and transport hole carriers and prevent charge recombination.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

CuGaO₂ Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells

Chen

Qiu

Wang

et al. 2022

ACS Appl. Nano Mater.

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“…Using isopropanol (IPA) as the solvent of Li‐TFSI greatly reduces the corrosion of the perovskite film, reduces the charge recombination, and finally improves efficiency of the device and significantly suppresses the hysteresis. [ 210 ] Recently, the fluorinated isomeric analogs (Spiro‐mF) of Spiro‐OMeTAD as an HTL can also reduce the hysteresis. [ 211 ] Spiro‐mF not only has better energy levels, but also can effectively suppress nonradiative recombination.…”

Section: Methods Of Reducing or Eliminating Hysteresismentioning

confidence: 99%

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Wang

Lei

et al. 2020

Solar RRL

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The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has exceeded 25%, showing great potential in the photovoltaic field. However, PSCs often show anomalous current density–voltage (J–V) hysteresis behavior in the forward and reverse scanning directions, which makes it impossible to accurately evaluate the performance of PSCs. Therefore, it is necessary to clearly understand the mechanism of hysteresis and suppress the hysteresis. Herein, the J–V hysteresis behavior in PSCs and strategies to suppress hysteresis is focused: first, the various factors that affect J–V hysteresis in PSCs are summarized. And the mechanism behind the various possible origins of hysteresis and the challenges encountered are explored. Then, the strategies to suppress or eliminate the hysteresis are summarized, including optimizing the perovskite light‐absorbing layer, improving the performance of the carrier transport layer and interface engineering. Finally, insights on the future development of the hysteresis are also provided.

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“…On the one hand, the metal halide perovskite are vulnerable to polar solvent and it is desired to avoid or reduce the use of acetonitrile. 10 On the other hand, the hygroscopic lithium salt facilitates moisture penetration and Li + ion migration that is accelerated under high temperature conditions induces lithium intercalation into the perovskite layer with the formation of deleterious defects. 11 Thus far, considerable efforts have been devoted to optimizing the HTL of PSCs for enhanced PCE and stability.…”

Section: Introductionmentioning

confidence: 99%

Crowning lithium ions in hole transport layer toward stable perovskite solar cells

Shen¹,

Deng²,

Chen³

et al. 2021

Preprint

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State-of-art perovskite solar cells exhibit comparable power conversion efficiency to silicon photovoltaics. However, the device stability remains a major obstacle that restricts widespread application. Doping hole transport layer induced hygroscopicity, ion diffusion, and use of polar solvent are detrimental factors for performance degradation of perovskite solar cells. Here, we report phase transfer catalyzed LiTFSI doping in Spiro-OMeTAD to address these negative impacts. 12-crown-4 as an efficient phase transfer catalyst promotes the dissolution of LiTFSI without requiring acetonitrile. Crowning Li+ ions by forming more stable and less diffusive crown ether-Li+ complexes retards the generation of hygroscopic lithium oxides and mitigates Li+ ion migration. Optimized solar cells deliver enhanced power conversion efficiency and significantly improved stability under humid and thermal conditions compared with the control device. This method can also be applied to dope π-conjugated polymer. Our findings provide a facile avenue to improve the long-term stability of perovskite solar cells.

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Solvent engineering of LiTFSI towards high-efficiency planar perovskite solar cells

Cited by 20 publications

References 39 publications

CuGaO₂ Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells

CuGaO₂ Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Crowning lithium ions in hole transport layer toward stable perovskite solar cells

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Solvent engineering of LiTFSI towards high-efficiency planar perovskite solar cells

Cited by 20 publications

References 39 publications

CuGaO2 Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells

CuGaO2 Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Crowning lithium ions in hole transport layer toward stable perovskite solar cells

Contact Info

Product

Resources

About

CuGaO₂ Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells

CuGaO₂ Nanosheet Arrays as the Hole-Transport Layer in Inverted Perovskite Solar Cells