Reformation of thiophene-functionalized phthalocyanine isomers for defect passivation to achieve stable and efficient perovskite solar cells

Qu, Geping; Khan, Danish; Yan, Feini; Atsay, Armağan; Xiao, Hui; Chen, Qian; Xu, Hu; Nar, Ilgın; Xu, Zong‐Xiang

doi:10.1016/j.jechem.2021.09.041

Cited by 33 publications

(19 citation statements)

References 65 publications

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“…Phthalocyanines (Pcs) and their derivatives have been widely used as dopant-free SM-HTMs or additives for highperformance PSCs owing to their low preparation cost, high solubility in organic solvents, outstanding thermal stability, high carrier mobility, and perovskite defect passivation capabilities. [22][23][24] Cao et al [25] reported Ni Pc decorated with four peripheral methoxyethoxy units, which showed the highest PCE of 21.23% among reported dopant-free Pc-based SM-HTMs. The PSCs also exhibited good moisture, thermal, and light stabilities (Figure 1).…”

Section: Dopant-free Phthalocyanine Hole Conductor With Thermal-induc...mentioning

confidence: 99%

Dopant‐Free Phthalocyanine Hole Conductor with Thermal‐Induced Holistic Passivation for Stable Perovskite Solar Cells with 23% Efficiency

Dong

Qiao

et al. 2022

Adv Funct Materials

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Simultaneous passivation of the defects at the surface and grain boundaries of perovskite films is crucial to achieve efficient and stable perovskite solar cells (PSCs). It is highly desirable to accomplish the above passivation through rational engineering of hole transport materials (HTMs) in combination with appropriate procedure optimization. Here, methylthiotriphenylamine-substituted copper phthalocyanine (SMe-TPA-CuPc) is reported as a dopant-free HTM for PSCs, exhibiting excellent efficiency, and stability. After thermal annealing, SMe-TPA-CuPc molecules diffused into the bulk of the perovskite film and effectively passivated the defects in the bulk and at the interface of the perovskite, owing to the strong interaction between the methylthio moiety and undercoordinated lead. The best-performing annealed SMe-TPA-CuPc-based device shows efficiency of 21.51%, which is higher than the unannealed SMe-TPA-CuPc-based device (power-conversion efficiency (PCE) of 20.75%) and reference doped spiro-OMeTAD-based device (PCE of 20.61%). Further modification of the perovskite of the annealed SMe-TPA-CuPc-based device by the QAPyBF4 additive result in even higher efficiency of 23.0%. It also shows excellent stability, maintaining 96% of its initial efficiency after 3624 h aging at 85 °C. This work highlights the great potential of phthalocyanine-based dopant-free HTMs and the defect passivation by thermal-induced molecular diffusion strategy for developing highly efficient and stable PSCs.

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Section: Dopant-free Phthalocyanine Hole Conductor With Thermal-induc...mentioning

confidence: 99%

Dopant‐Free Phthalocyanine Hole Conductor with Thermal‐Induced Holistic Passivation for Stable Perovskite Solar Cells with 23% Efficiency

Dong

Qiao

et al. 2022

Adv Funct Materials

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“…The molecular interactions are vertical, while SM‐HTM is a more linear type, [ 65 ] while the steric molecule is flat and intermolecular stacking is horizontal. [ 100 ] Both of these molecular shapes are planar w.r.t to their designs.…”

Section: Intrinsic Molecular Properties and Devices Performancementioning

confidence: 99%

Nexuses Between the Chemical Design and Performance of Small Molecule Dopant‐Free Hole Transporting Materials in Perovskite Solar Cells

Khan

Liu

et al. 2022

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interface defects, energy alignments, device stability, and charge extraction and transportation. [3][4][5][6][7][8] Since 2009, Miyasaka and colleagues have attempted to use perovskite structures as light-harvesting layers of dye synthesized solar cells and achieved a PCE of 3.8% with an iodide/ triiodide-based redox shuttle and liquid electrolyte. [9] In 2011, Park and co-workers enhanced the PCE of the liquid-based perovskite solar cell to 6.5% by modifying the titania surface and the processing method for deposition of the perovskite absorber layer. [10] However, these devices were unstable and degraded quickly because perovskite compounds dissolved in liquid electrolytes. [11] Both Park and Snaith groups demonstrated that the liquid electrolyte could be replaced with 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenyla m i n e ) -9 , 9 ′ -s p i r o b i f l u o r e n e ( s p i r o -OMeTAD), which serves as the hole transport material (HTM). The corresponding solid-state PSCs exhibited enhanced efficiencies of 9.7% and 10.9%. [3,4] Since then, PSCs have become an international hot topic, and this direction has also entered a stage of rapid development.Generally, PSCs are categorized in three different architectures: planar n-i-p, mesoporous n-i-p, and inverted planar p-i-n, as shown in Figure 1a,b, and c, respectively. HTM layer in n-i-p devices is exposed to oxygen, moisture, while in p-i-n devices, it acts as the base surface for perovskite layer deposition. At both positions, HTM plays an essential role in device stability and controls the interface defects, energy alignments, charge extraction, and transportation. In p-i-n PSCs, the inorganic HTMs, poly (3, 4-ethylenedioxythiophene)-poly (styrenesulfonate) (PEDOT: PSS) and poly[bis(4-phenyl)(2,5,6-trimethylphenyl)amine] (PTAA) are commonly incorporated as HTMs where inorganic HTMs usually show good device stability. Still, the achievable PCE is limited by their relatively low intrinsic conductivity and surface defects. [12] Polymeric HTMs result in good morphological properties but inferior reproducibility and stability, particularly when dopants are needed for high efficiency devices. [13] On the other side, the n-i-p type is the most studied, with spiro-OMeTAD as primary HTM. In the earlier development of PSCs, spiro-OMeTAD as HTM sets several PCE records due to its ease of processing, somehow

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“…A perovskite photoabsorber methylammonium lead iodide, MAPbI 3 consisting of lead iodide PbI 2 (99.995%, Aldrich) and iodide methylammonium MAI (98%, Aldrich) was fabricated by simultaneous deposition of the components from two sources. Titanyl phthalocyanine TiOPc (95%, Alfa Aesar) [19,[22][23][24] and fullerene C 60 (99.9%, Aldrich) [2,25] were deposited before and after MAPbI 3 , respectively, and served as auxiliary photoactive and/or charge-carrier layers. The choice of materials was determined by the need to modify the interfaces between the perovskite photoabsorber and the adjacent charge-carrier layers, which is essential for the operation stability of PSC under load.…”

Section: Fabrication Of Perovskite Solar Cellsmentioning

confidence: 99%

Molecular optical filtering in perovskite solar cells

Travkin

Koptyaev

Hamdoush

et al. 2022

J Mater Sci: Mater Electron

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In this paper, we investigate the applicability of a vacuum-deposited layer of porphyrazine [series] pigment, the tris(1,2,5-thiadiazolo)subporphyrazinatoboron(III) chloride (SubPzS 3 ), as optical filter for inverted perovskite solar cells. Thin films formed from this material are characterized by a narrow, high-intensity absorption band in the visible range, with a maximum at * 545 nm. The operation stability of the device was assessed by the dynamic J-V characteristics. The efficiency of solar cells equipped with such optical filter is lower due to a decrease in the total number of photons absorbed by the perovskite layer. However, their stability to photolysis by the impact of sunlight is higher and, what is more, the filtered radiation has a stabilizing effect on the performance of cells under long-term illumination. Transformation of the perovskite material in the solar cells is determined by a trade-off between destructive and healing photons that penetrate into the perovskite photoabsorber depending on whether or not it has a filtering layer.

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Reformation of thiophene-functionalized phthalocyanine isomers for defect passivation to achieve stable and efficient perovskite solar cells

Cited by 33 publications

References 65 publications

Dopant‐Free Phthalocyanine Hole Conductor with Thermal‐Induced Holistic Passivation for Stable Perovskite Solar Cells with 23% Efficiency

Dopant‐Free Phthalocyanine Hole Conductor with Thermal‐Induced Holistic Passivation for Stable Perovskite Solar Cells with 23% Efficiency

Nexuses Between the Chemical Design and Performance of Small Molecule Dopant‐Free Hole Transporting Materials in Perovskite Solar Cells

Molecular optical filtering in perovskite solar cells

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