Learning from hole-transporting polymers in regular perovskite solar cells to construct efficient conjugated polyelectrolytes for inverted devices

Zhang, Luozheng; Zhou, Xianyong; Xie, Jiaming; Hu, Bihua; Liu, Peiying; Chen, Shi; Bae, Sang‐Hoon; Kim, Jeehwan; Dai, Songyuan; Xu, Baomin

doi:10.1016/j.cej.2021.129735

Cited by 9 publications

(7 citation statements)

References 43 publications

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“…The chemical corrosion of metal electrodes on the organic HTLs can be inhibited in inorganic HTL-based PSCs due to the more stable interface between inorganic HTL and the metal electrode [ 81 , 82 ]. Until now, the PCEs of inorganic HTL-based PSCs are still lower than those of organic HTL-based PSCs mainly due to the detrimental interfacial reaction between inorganic HTLs and perovskite film, which reduced the hole extraction capability and increased the carrier recombination rate at interfaces, leading to serious open circuit voltages (V OC ) loss and accelerated decomposition of perovskite film [ 83 , 84 ]. For example, Ni 3+ cations in NiO x HTL can react with the A-site cationic salts in the perovskite precursors, which reduces the amount of Ni 3+ cations in NiO x , leading to lower conductivity of NiO x HTL and reduced PCEs of PSCs [ 85 ].…”

Section: Current Research Status Of Htls In Pscsmentioning

confidence: 99%

Recent Advances in Nanostructured Inorganic Hole-Transporting Materials for Perovskite Solar Cells

et al. 2022

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Organic−inorganic halide perovskite solar cells (PSCs) have received particular attention in the last decade because of the high−power conversion efficiencies (PCEs), facile fabrication route and low cost. However, one of the most crucial obstacles to hindering the commercialization of PSCs is the instability issue, which is mainly caused by the inferior quality of the perovskite films and the poor tolerance of organic hole−transporting layer (HTL) against heat and moisture. Inorganic HTL materials are regarded as promising alternatives to replace organic counterparts for stable PSCs due to the high chemical stability, wide band gap, high light transmittance and low cost. In particular, nanostructure construction is reported to be an effective strategy to boost the hole transfer capability of inorganic HTLs and then enhance the PCEs of PSCs. Herein, the recent advances in the design and fabrication of nanostructured inorganic materials as HTLs for PSCs are reviewed by highlighting the superiority of nanostructured inorganic HTLs over organic counterparts in terms of moisture and heat tolerance, hole transfer capability and light transmittance. Furthermore, several strategies to boost the performance of inorganic HTLs are proposed, including fabrication route design, functional/selectively doping, morphology control, nanocomposite construction, etc. Finally, the challenges and future research directions about nanostructured inorganic HTL−based PSCs are provided and discussed. This review presents helpful guidelines for the design and fabrication of high−efficiency and durable inorganic HTL−based PSCs.

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Section: Current Research Status Of Htls In Pscsmentioning

confidence: 99%

Recent Advances in Nanostructured Inorganic Hole-Transporting Materials for Perovskite Solar Cells

et al. 2022

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“…slowed the oxidation of SnI 2 dissolved in N,N-dimethylformamide (DMF) solution (Figure S15, Supporting Information). The interaction between Sn 2+ and DPI-TPFB was also observed through nuclear magnetic resonance ( 1 H, 11 B, 19 F, and 119 Sn NMR, Figures S16-S19, Supporting Information). In addition, we compared the thermal stability of encapsulated and unencapsulated Sn-PSCs (Figure S20a, Supporting Information).…”

Section: Long-term Stability Of Fasni 3 -Pscs Fabricated Using Spiro-...mentioning

confidence: 81%

“…[11][12][13][14] Most researchers consider that the main reason for this lag lies in the limitations of hole-transporting materials (HTMs). [15][16][17] Compared to the numerous studies performed on the HTMs optimization for Pbbased PSCs, [18][19][20][21][22] studies on the Sn-based counterparts are sparse because of the poor reproducibility and low performance of Sn-PSCs with an n-i-p structure, which significantly reduces the attractiveness for researchers. Despite this, tin-based perovskites are theoretically considered a more suitable for n-i-p structures due to their p-type conduction behavior.…”

mentioning

confidence: 99%

Highly Stable n–i–p Structured Formamidinium Tin Triiodide Solar Cells through the Stabilization of Surface Sn²⁺ Cations

Risqi

et al. 2023

Adv Funct Materials

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Improving the performance, reproducibility, and stability of Sn-based perovskite solar cells (PSCs) with n-i-p structures is an important challenge. Spiro-OMeTAD [2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene], a hole transporting material (HTM) with n-i-p structure, requires the oxygen exposure after addition of Li-TFSI [Lithium bis(trifluoromethanesulfonyl) imide] as a dopant to increase the hole concentration. In Sn-based PSC, Sn 2+ is easily oxidized to Sn 4+ under such a condition, resulting in a sharp decrease in efficiency. Herein, a formamidinium tin triiodide (FASnI 3 )-based PSCs fabricated using DPI-TPFB [4-Isopropyl-4′-methyldiphenyliodonium tetrakis(pentafluorophenyl)borate] instead of Li-TFSI are reported as a dopant in Spiro-OMeTAD. The DPI-TPFB enables the fabrication of PSCs with an efficiency of up to 10.9%, the highest among FASnI 3 -based PSCs with n-i-p structures. Moreover, ≈80% of the initial efficiency is maintained even after 1,597 h under maximum power point tracking conditions. In particular, the encapsulated device does not show any decrease in efficiency even after holding for 50 h in the 85 °C/85% RH condition. The high efficiency and excellent stability of PSCs prepared by doping with DPI-TPFB are attributed to not only increasing electrical conductivity by acting as a Lewis acid, but also stabilizing Sn 2+ through coordination with Sn 2+ on the surface of FASnI 3 .

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“…To date, a large number of defect passivation strategies have been proposed. From 2019, in addition to endowing an additional passivation layer, exploring effective multifunctional hole-transporting materials (HTMs) with passivation functions has demonstrated to be a simplified and efficient method to alleviate the perovskite defects. ,− In comparison with small molecules, polymers exhibit better thermal stability, interfacial adhesion, and tunable energy levels, such as 2DP-TDB, PC6, PBDB-Cz, PBT1-C, PE10, PBDTT, P3, DTB(x-DEG), PPY2, PTTI-TPA, etc. Nevertheless, most of the reported polymeric HTMs were applied to fabricate n-i-p regular PSCs.…”

Section: Introductionmentioning

confidence: 99%

A Multifunctional Fluorinated Polymer Enabling Efficient MAPbI₃-Based Inverted Perovskite Solar Cells

Luo

Zong

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Exploring polymeric hole-transporting materials (HTMs) with passivation functions represents a simplified and effective approach to minimize the perovskite defect density. To date, most of reported polymeric HTMs were applied to fabricate n-i-p regular perovskite solar cells (PSCs). The polymers compatible for p-i-n inverted PSCs were very limited. Moreover, the passivation polymers were devoted to passivate the uncoordinated Pb2+. However, the MA+ cation defect has profound unwanted effect on device efficiency and long-term stability. In order to synchronously passivate the Pb2+ and MA+ defects in p-i-n inverted PSCs, a new nonfused polymer was intentionally explored via mild polymerization. The aromatic bridge instead of long alkyl chains enabled polymer BN-12 to achieve excellent thermal stability and good wettability of perovskite precursor. Furthermore, the incorporation of chemical anchor sites (“CO” and “F”) strongly controlled the crystallization of perovskite and restrained the MA+ ion migration. As a result, a significant fill factor (FF) of 82.9% and an enhanced power conversion efficiency (PCE) of 20.28% were achieved for MAPbI3-based devices with the dopant-free BN-12, exceeding those with the commercial HTM PTAA (FF = 81.7%, PCE = 19.51%). More importantly, the unencapsulated devices based on BN-12 realized outstanding long-term stability, maintaining approximately 95% of its initial efficiency after stored for 85 days. By contrast, the PTAA-based device showed rapid decrease which retained only 50% of its initial value after 45 days.

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Learning from hole-transporting polymers in regular perovskite solar cells to construct efficient conjugated polyelectrolytes for inverted devices

Cited by 9 publications

References 43 publications

Recent Advances in Nanostructured Inorganic Hole-Transporting Materials for Perovskite Solar Cells

Recent Advances in Nanostructured Inorganic Hole-Transporting Materials for Perovskite Solar Cells

Highly Stable n–i–p Structured Formamidinium Tin Triiodide Solar Cells through the Stabilization of Surface Sn²⁺ Cations

A Multifunctional Fluorinated Polymer Enabling Efficient MAPbI₃-Based Inverted Perovskite Solar Cells

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Learning from hole-transporting polymers in regular perovskite solar cells to construct efficient conjugated polyelectrolytes for inverted devices

Cited by 9 publications

References 43 publications

Recent Advances in Nanostructured Inorganic Hole-Transporting Materials for Perovskite Solar Cells

Recent Advances in Nanostructured Inorganic Hole-Transporting Materials for Perovskite Solar Cells

Highly Stable n–i–p Structured Formamidinium Tin Triiodide Solar Cells through the Stabilization of Surface Sn2+ Cations

A Multifunctional Fluorinated Polymer Enabling Efficient MAPbI3-Based Inverted Perovskite Solar Cells

Contact Info

Product

Resources

About

Highly Stable n–i–p Structured Formamidinium Tin Triiodide Solar Cells through the Stabilization of Surface Sn²⁺ Cations

A Multifunctional Fluorinated Polymer Enabling Efficient MAPbI₃-Based Inverted Perovskite Solar Cells