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High‐Performance Inverted Planar Perovskite Solar Cells Enhanced by Thickness Tuning of New Dopant‐Free Hole Transporting Layer
摘要： A new hole transporting material (HTM) named DMZ is synthesized and employed as a dopant-free HTM in inverted planar perovskite solar cells (PSCs). Systematic studies demonstrate that the thickness of the hole transporting layer can effectively enhance the morphology and crystallinity of the perovskite layer, leading to low series resistance and less defects in the crystal. As a result, the champion power conversion efficiency (PCE) of 18.61% with JSC = 22.62 mA cm?2, VOC = 1.02 V, and FF = 81.05% (an average one is 17.62%) is achieved with a thickness of ≈13 nm of DMZ (2 mg mL?1) under standard global AM 1.5 illumination, which is ≈1.5 times higher than that of devices based on poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT:PSS). More importantly, the devices based on DMZ exhibit a much better stability (90% of maximum PCE retained after more than 556 h in air (relative humidity ≈ 45%–50%) without any encapsulation) than that of devices based on PEDOT:PSS (only 36% of initial PCE retained after 77 h in same conditions). Therefore, the cost-effective and facile material named DMZ offers an appealing alternative to PEDOT:PSS or polytriarylamine for highly efficient and stable inverted planar PSCs.
关键词： inverted planar structure,perovskite solar cells,dopant-free,hole transporting materials
更新于2025-09-11 14:15:04
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Hole‐Boosted Cu(Cr,M)O <sub/>2</sub> Nanocrystals for All‐Inorganic CsPbBr <sub/>3</sub> Perovskite Solar Cells
摘要： The all-inorganic CsPbBr3 perovskite solar cell (PSC) is a promising solution to balance the high efficiency and poor stability of state-of-the-art organic–inorganic PSCs. Setting inorganic hole-transporting layers at the perovskite/electrode interface decreases charge carrier recombination without sacrificing superiority in air. Now, M-substituted, p-type inorganic Cu(Cr,M)O2 (M = Ba2+, Ca2+, or Ni2+) nanocrystals with enhanced hole-transporting characteristics by increasing interstitial oxygen effectively extract holes from perovskite. The all-inorganic CsPbBr3 PSC with a device FTO/c-TiO2/m-TiO2/CsPbBr3/Cu(Cr,M)O2/ structure carbon achieves an efficiency up to 10.18 % and it increases to 10.79 % by doping Sm3+ ions into perovskite halide, which is much higher than 7.39 % for the hole-free device. The unencapsulated Cu(Cr,Ba)O2-based PSC presents a remarkable stability in air in either 80 % humidity over 60 days or 80 8C conditions over 40 days or light illumination for 7 days.
关键词： CsPbBr3,inorganic hole-transporting materials,all-inorganic perovskite solar cells,long-term stability,perovskites
更新于2025-09-11 14:15:04
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Hole-Boosted Cu(Cr,M)O <sub/>2</sub> Nanocrystals for All-Inorganic CsPbBr <sub/>3</sub> Perovskite Solar Cells
摘要： The all-inorganic CsPbBr3 perovskite solar cell (PSC) is a promising solution to balance the high efficiency and poor stability of state-of-the-art organic–inorganic PSCs. Setting inorganic hole-transporting layers at the perovskite/electrode interface decreases charge carrier recombination without sacrificing superiority in air. Now, M-substituted, p-type inorganic Cu(Cr,M)O2 (M = Ba2+, Ca2+, or Ni2+) nanocrystals with enhanced hole-transporting characteristics by increasing interstitial oxygen effectively extract holes from perovskite. The all-inorganic CsPbBr3 PSC with a device FTO/c-TiO2/m-TiO2/CsPbBr3/Cu(Cr,M)O2/carbon structure achieves an efficiency up to 10.18 % and it increases to 10.79 % by doping Sm3+ ions into perovskite halide, which is much higher than 7.39 % for the hole-free device. The unencapsulated Cu(Cr,Ba)O2-based PSC presents a remarkable stability in air in either 80 % humidity over 60 days or 80 8C conditions over 40 days or light illumination for 7 days.
关键词： CsPbBr3,inorganic hole-transporting materials,all-inorganic perovskite solar cells,long-term stability,perovskites
更新于2025-09-11 14:15:04
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Facile-effective Hole Transporting Materials Based on Dibenzo[a,c]carbazole: The Key Role of Linkage Position to Photovoltaic Performance of Perovskite Solar Cells
摘要： Film morphology of hole-transporting layer is proved as the key element to charge transfer and interfacial property in perovskite solar cells. In this text, a new dibenzo[a,c]carbazole (DBC) core with multiple reaction sites has been formed with Y-shape, in which, the phenathrene group was integrated as a plane π structure into the common carbazole moiety. Accordingly, three DBC-based hole-transporting materials (HTMs) with varied molecular configurations were synthesized by the introduction of N-(4-methoxyphenyl)-9,9-dimethyl-9H-fluoren-2-amine (F(Me)NPh) as the periphery groups at different linkage positions. Once being applied to perovskite solar cells as HTMs, DBC-2 with the twisted and asymmetric structure achieved the highest conversion efficiency of 20.02%. Also, the corresponding dopant-free device exhibited the PCE of 16.43% and good device stability, under glovebox and ambient conditions.
关键词： hole-transporting materials,dibenzo[a,c]carbazole,perovskite solar cells,molecular configurations,photovoltaic performance
更新于2025-09-11 14:15:04
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A Molecular Design Strategy in Developing Titanyl Phthalocyanines as Dopant-Free Hole Transporting Materials for Perovskite Solar Cells: Peripheral or Non-Peripheral Substituents?
摘要： We demonstrate a molecular design strategy to enhance the efficiency of phthalocyanine (Pc) based hole transporting materials (HTMs) in perovskite solar cells (PSCs). Herein, two titanyl phthalocyanine (TiOPc) derivatives are designed and applied as dopant-free HTMs in planar n-i-p structured PSCs. The newly developed TiOPc compounds possess eight n-hexylthio groups attached to either peripheral (P-SC6-TiOPc) or non-peripheral (NP-SC6-TiOPc) positions of the Pc ring. Utilizing these dopant-free HTMs in PSCs with a mixed cation perovskite as the light absorbing material and tin oxide (SnO2) as the electron transporting material (ETM) results in a considerably enhanced efficiency for NP-SC6-TiOPc based devices compared to PSCs using P-SC6-TiOPc. Hence, all the photovoltaic parameters, including power conversion efficiency (PCE), fill factor, open circuit voltage and short-circuit current density are remarkably improved from 5.33 ± 1.01%, 33.34 ± 3.45%, 0.92 ± 0.18 V, and 17.33 ± 2.08 mA cm-2 to 15.83 ± 0.44%, 69.03 ± 1.59%, 1.05 ± 0.01 V, and 21.80 ± 0.36 mA cm-2, respectively, when using the non-peripheral substituted TiOPc derivative as the HTM in a PSC. Experimental and computational analysis suggests more compact molecular packing for NP-SC6-TiOPc than P-SC6-TiOPc in the solid state due to stronger π-π interactions, leading to thin films with better quality and higher performance in hole extraction and transportation. PSCs with NP-SC6-TiOPc also offer much higher long-term stability than P-SC6-TiOPc based devices, under ambient conditions with a relative humidity of 75%.
关键词： non-peripheral substituents,titanyl phthalocyanines,perovskite solar cells,power conversion efficiency,hole transporting materials
更新于2025-09-11 14:15:04