Inverted planar heterojunction perovskite solar cells with high ultraviolet stability

Zhu, Xueliang; Lau, Cho Fai Jonathan; Mo, Kangwei; Cheng, Siyang; Xu, Yalun; Li, Ruiming; Wang, Cheng; Zheng, Qixian; Liu, Yong; Wang, Ti; Lin, Qianqian; Wang, Zhiping

doi:10.1016/j.nanoen.2022.107849

Cited by 51 publications

(46 citation statements)

References 59 publications

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“…There are also other possible contributing factors to the observed decrease in stability for amine-based surface modification, despite defect passivation on modified surface. Complex dependence between buried interface modifications, efficiency, and stability also occurs in part due to the coexistence of different deep and shallow defects, with deep defects affecting the efficiency, while shallow defects affect the ion migration and stability. ,, It was proposed that 2PACz passivation inhibits the formation of shallow traps at NiO x /perovskite interface under UV illumination, and that lower lifetime in devices with NiO x without surface modifications could be attributed to NiO-induced deprotonation of organic cation . NiO x surface passivation could mitigate deprotonation, but different molecules resulted in different stability improvements .…”

Section: Resultsmentioning

confidence: 99%

“…30−32 These molecules can bind to a variety of metal oxides, either by tridentate binding or a mixture of bidentate binding and hydrogen bonding. 30 Commonly used phosphonic acid based surface modifiers include [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) 6,17,18,[21][22][23]26,27 and MeO-2PACz ([2-(3,6-dimethoxy-9H-carbazol-9-yl)ethyl]phosphonic acid). 10,14,18,20,25,26 2PACz in particular has been identified as a surface modifying molecule leading to favorable energy level alignment and significant suppression of interfacial defects in PSCs.…”

Section: ■ Introductionmentioning

confidence: 99%

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Dual Surface Modifications of NiO_x/Perovskite Interface for Enhancement of Device Stability

Lin

Wang

Khaleed

et al. 2023

ACS Appl. Mater. Interfaces

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Various phosphonic acid based self-assembled monolayers (SAMs) have been commonly used for interface modifications in inverted perovskite solar cells. This typically results in significant enhancement of the hole extraction and consequent increase in the power conversion efficiency. However, the surface coverage and packing density of SAM molecules can vary, depending on the chosen SAM material and underlying oxide layer. In addition, different SAM molecules have diverse effects on the interfacial energy level alignment and perovskite film growth, resulting in complex relationships between surface modification, efficiency, and lifetime. Here we show that ethanolamine surface modification combined with [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) results in significant improvement in device stability compared to devices with 2PACz modification only. The significantly smaller size of ethanolamine enables it to fill any gaps in 2PACz coverage and provide improved interfacial defect passivation, while its different chemical structure enables it to provide complementary effects to 2PACz passivation. Consequently, the perovskite films are more stable under illumination (slower photoinduced segregation), and the devices exhibit significant stability enhancement. Despite similar power conversion efficiencies (PCE) between 2PACz only and combined ethanolamine-2PACz modification (PCE of champion devices ∼21.6–22.0% for rigid and ∼20.2–21.0% for flexible devices), the T 80 lifetime under simulated solar illumination in ambient is improved more than 15 times for both rigid and flexible devices.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Dual Surface Modifications of NiO_x/Perovskite Interface for Enhancement of Device Stability

Lin

Wang

Khaleed

et al. 2023

ACS Appl. Mater. Interfaces

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“…Then, the substrates were treated with UV–ozone for 15 min to remove any chemical residuals and enhance the surface wettability of the FTO substrates. The preparation of the NiO x layer referred to the previous work of our group . Nickel(II) acetylacetonate was dissolved in anhydrous ethanol (32.11 mg mL –1 ) with the addition of 17 μL of HCl and stirred overnight at room temperature.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…The preparation of the NiO x layer referred to the previous work of our group. 43 Nickel(II) acetylacetonate was dissolved in anhydrous ethanol (32.11 mg mL −1 ) with the addition of 17 μL of HCl and stirred overnight at room temperature. The NiO x precursor solution was allowed to spin on the FTO substrates at 4000 rpm for 40 s in a dry box and annealed at 400 °C for 45 min in air.…”

Section: Solar Cell Fabricationmentioning

confidence: 99%

Tuning Surface Oxidation States of Nickel Oxide for Efficient Inverted Perovskite Solar Cells

Yang

Zhu

et al. 2023

ACS Appl. Energy Mater.

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Nickel oxide (NiO x ), as an inorganic p-type semiconductor, has been widely adopted as hole-transporting layers in perovskite solar cells. Despite its superior material stability, the poor charge extraction and multi-vacancies greatly restrict the photovoltages and efficiencies. Here, we propose a facile method to tune the surface oxidation states of NiO x films by a lithium salt treatment for photovoltage enhancement. X-ray photoelectron spectroscopy measurement indicates that the lithium treatment only reduces the Ni 3+ sites at the top region rather than in the bulk of NiO x films. This graded distribution allows more efficient charge extraction at the NiO x /perovskite interface as revealed by photoluminescence studies. Through a combination of capacitance− voltage and drive-level capacitance profiling measurements, we confirm enhanced built-in potentials and decreased interface defect densities in lithium-modified devices. Further modifying the interface with a self-assembly monolayer, the energy offsets at the interface can be largely reduced. Based on these enhanced properties, the modified devices achieve a high-power conversion efficiency of 22.4% (0.07 cm 2 ) with a 120 mV enhancement in photovoltage in comparison with the untreated devices.

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“…), − metallic oxides (Cu 2 O, NiO X , etc. ) , and transition-metal sulfides (MoS 2 , WS 2 , etc. ) , have been attractively utilized to assemble stable and efficient PSCs.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Interstitial Oxygen-Enabled Efficient CuAl(M)O₂ Hole Extractors for Air-Stable All-Inorganic Perovskite Solar Cells

Bao

Sui

Gong

et al. 2023

ACS Sustainable Chem. Eng.

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The incorporation of an inorganic hole transport material (HTM) with high hole mobility and matched energetics at the back interface of perovskite/carbon plays a major role in improving the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). Here, M3+ (M = Sc, Y, and La)-doped CuAlO2, CuAl(M)O2, with superior p-type conductivity and suitable energy band is inserted between the CsPbBr3 perovskite layer and carbon electrode as an efficient HTM to enhance hole extraction and reduce energy loss within carbon-based CsPbBr3 PSCs. The balance between the increased interstitial oxygen concentration and the carrier scattering caused by the lattice distortion of CuAl(M)O2 endows a higher hole mobility of CuAl(Sc)O2, giving a substantially increased PCE of 10.13% of the CuAl(Sc)O2 tailored CsPbBr3 PSCs, compared with the 6.5% efficiency of the device without HTMs. Moreover, the CuAl(Sc)O2-based CsPbBr3 PSCs without packaging still have 90% of the original efficiency after being stored for 720 h in an air environment with a relative humidity of 85% at 85 °C, exhibiting an outstanding long-term humidity-thermal tolerance.

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Inverted planar heterojunction perovskite solar cells with high ultraviolet stability

Cited by 51 publications

References 59 publications

Dual Surface Modifications of NiO_x/Perovskite Interface for Enhancement of Device Stability

Dual Surface Modifications of NiO_x/Perovskite Interface for Enhancement of Device Stability

Tuning Surface Oxidation States of Nickel Oxide for Efficient Inverted Perovskite Solar Cells

Enhanced Interstitial Oxygen-Enabled Efficient CuAl(M)O₂ Hole Extractors for Air-Stable All-Inorganic Perovskite Solar Cells

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Inverted planar heterojunction perovskite solar cells with high ultraviolet stability

Cited by 51 publications

References 59 publications

Dual Surface Modifications of NiOx/Perovskite Interface for Enhancement of Device Stability

Dual Surface Modifications of NiOx/Perovskite Interface for Enhancement of Device Stability

Tuning Surface Oxidation States of Nickel Oxide for Efficient Inverted Perovskite Solar Cells

Enhanced Interstitial Oxygen-Enabled Efficient CuAl(M)O2 Hole Extractors for Air-Stable All-Inorganic Perovskite Solar Cells

Contact Info

Product

Resources

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Dual Surface Modifications of NiO_x/Perovskite Interface for Enhancement of Device Stability

Dual Surface Modifications of NiO_x/Perovskite Interface for Enhancement of Device Stability

Enhanced Interstitial Oxygen-Enabled Efficient CuAl(M)O₂ Hole Extractors for Air-Stable All-Inorganic Perovskite Solar Cells