Efficient α-CsPbI3 Photovoltaics with Surface Terminated Organic Cations

Wang, Yong; Zhang, Taiyang; Kan, Miao; Li, Yihui; Wang, Tian; Zhao, Yixin

doi:10.1016/j.joule.2018.06.013

Cited by 295 publications

(300 citation statements)

References 45 publications

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“…TheC s-1.5DMAI based champion device has only achieved about 16.6 %P CE because of the low V oc and FF stemming from the defects in the perovskite layer. We then passivated the Cs-1.5 DMAI sample by spin coating 5mm PTACli sopropanol solution, the final perovskite sample is then denoted as PTACl-CsPbI 3 .Similar to previously reported PEA + cations, [14,23] the organic cation PTAw ith hydrophobic benzene group can not only improve the humidity stability but also effectively passivate the surface defects.The absorbance of PTACl-CsPbI 3 exhibited circa 4nmb lue shift compared to that of CsPbI 3 ,which could be due to Cl doping in the PTACl-CsPbI 3 thin film. Them orphology of PTACl-CsPbI 3 is similar to that of Cs-1.5DMAI (Supporting Information, Figure S13).…”

Section: Resultsmentioning

confidence: 86%

The Role of Dimethylammonium Iodide in CsPbI₃ Perovskite Fabrication: Additive or Dopant?

et al. 2019

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The controllable growth of CsPbI3 perovskite thin films with desired crystal phase and morphology is crucial for the development of high efficiency inorganic perovskite solar cells (PSCs). The role of dimethylammonium iodide (DMAI) used in CsPbI3 perovskite fabrication was carefully investigated. We demonstrated that the DMAI is an effective volatile additive to manipulate the crystallization process of CsPbI3 inorganic perovskite films with different crystal phases and morphologies. The thermogravimetric analysis results indicated that the sublimation of DMAI is sensitive to moisture, and a proper atmosphere is helpful for the DMAI removal. The time‐of‐flight secondary ion mass spectrometry and nuclear magnetic resonance results confirmed that the DMAI additive would not alloy into the crystal lattice of CsPbI3 perovskite. Moreover, the DMAI residues in CsPbI3 perovskite can deteriorate the photovoltaic performance and stability. Finally, the PSCs based on phenyltrimethylammonium chloride passivated CsPbI3 inorganic perovskite achieved a record champion efficiency up to 19.03 %.

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Section: Resultsmentioning

confidence: 86%

The Role of Dimethylammonium Iodide in CsPbI₃ Perovskite Fabrication: Additive or Dopant?

et al. 2019

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“…When perovskites are made from solutions with stoichiometries for n >10, they mainly exhibit a 3D character although the stability of 2D perovskites is somewhat preserved. In general, 2D/3D perovskites present long‐term stability, higher efficiency, and enhanced reproducibility in fabrication processes compared to 3D ones; in some cases, the fabricated solar cells do not even need encapsulation . Nazeeruddin and co‐workers developed a 2D/3D multidimensional junction perovskite concept, where a 2D/3D interface combines the enhanced 2D perovskite stability with the panchromatic absorption and excellent charge transport of the 3D perovskite .…”

Section: Devicesmentioning

confidence: 99%

Two‐Dimensional Halide Perovskites in Solar Cells: 2D or not 2D?

2019

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Two‐dimensional (2D) halide perovskites have recently emerged as a more stable and more versatile family of materials than three‐dimensional (3D) perovskite solar cell absorbers. Although solar cells made with 2D perovskites have yet to improve their power conversion efficiencies to compete with 3D perovskite solar cells, their immense diversity offers great opportunities and avenues for research that will likely close the gap between these two. Further, 2D perovskites can have various roles within a solar cell, either as the primary light absorber, as a capping layer, passivating layer, or within a mixed 2D/3D perovskite solar cell absorber. In this Minireview, we will review the history of 2D perovskites in solar cells, the relevant properties of such materials, the different roles that they can play in a solar cell, as well as current trends and challenges.

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“…It means that the organic salts, such as methylammonium (MA) and/or formamidinium (FA) in perovskite films, would be degraded thermally over 200 °C which shows extremely negative effect in PVSCs. Alternatively, the all‐inorganic‐based semiconducting perovskite films, such as CsPbBr 3 , CsPbI 3 , or CsPbI 2 Br, possess higher thermal stability than organic ones with the degradation temperature over 400 °C . Thus, the all‐inorganic PVSCs are attracting much more attention academically and commercially, to visualize the stable and high‐efficiency solar cell products.…”

Section: Methodsmentioning

confidence: 99%

The Energy‐Alignment Engineering in Polytriphenylamines‐Based Hole Transport Polymers Realizes Low Energy Loss and High Efficiency for All‐Inorganic Perovskite Solar Cells

et al. 2019

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The energy loss (Eloss) control via interfacial engineering is a significant indispensible methodology to realize high‐performance all‐inorganic perovskite solar cells (PVSCs). Herein, three novel polytriphenylamine‐based polymer derivatives (H‐Z1, H‐Z2, and H‐Z3) are synthesized, and the energy levels of these polymers are tuned feasibly through introducing the electron‐withdrawing group of trifluoromethyl in the triphenylamine (TPA) unit. These very deep HOMO energy levels are very beneficial for improving the open‐circuit voltages (Vocs) in PVSCs with the potentially decreased Elosss. Due to the gradual deepening of HOMO energy levels from H‐Z1, H‐Z2 to H‐Z3, the Vocs are elevated from 1.23, 1.28 to 1.30 V, respectively, where the Elosss are decreased from 0.69, 0.64, to 0.62 eV for H‐Z1, H‐Z2, and H‐Z3, respectively. Interestingly, both of the H‐Z1‐ and H‐Z2‐based devices show the highest PCEs, over 14%, in all‐inorganic PVSCs, which are effectively comparable to the results of reference device using Spiro‐OMeTAD as HTL. Thus, through the efficient atomic engineering and chemical modification in corresponding p‐typed polymers, excellent hole transport polymers are achieved for high‐performance and stable PVSCs with very low Eloss.

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Efficient α-CsPbI3 Photovoltaics with Surface Terminated Organic Cations

Cited by 295 publications

References 45 publications

The Role of Dimethylammonium Iodide in CsPbI₃ Perovskite Fabrication: Additive or Dopant?

The Role of Dimethylammonium Iodide in CsPbI₃ Perovskite Fabrication: Additive or Dopant?

Two‐Dimensional Halide Perovskites in Solar Cells: 2D or not 2D?

The Energy‐Alignment Engineering in Polytriphenylamines‐Based Hole Transport Polymers Realizes Low Energy Loss and High Efficiency for All‐Inorganic Perovskite Solar Cells

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Efficient α-CsPbI3 Photovoltaics with Surface Terminated Organic Cations

Cited by 295 publications

References 45 publications

The Role of Dimethylammonium Iodide in CsPbI3 Perovskite Fabrication: Additive or Dopant?

The Role of Dimethylammonium Iodide in CsPbI3 Perovskite Fabrication: Additive or Dopant?

Two‐Dimensional Halide Perovskites in Solar Cells: 2D or not 2D?

The Energy‐Alignment Engineering in Polytriphenylamines‐Based Hole Transport Polymers Realizes Low Energy Loss and High Efficiency for All‐Inorganic Perovskite Solar Cells

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The Role of Dimethylammonium Iodide in CsPbI₃ Perovskite Fabrication: Additive or Dopant?

The Role of Dimethylammonium Iodide in CsPbI₃ Perovskite Fabrication: Additive or Dopant?