Self-assembled monolayers as emerging hole-selective layers enable high-performance thin-film solar cells

Li, Mingliang; Xie, Yunfei; Lin, Francis; Li, Ziwei; Yang, Shuang; Jen, Alex K.‐Y.

doi:10.1016/j.xinn.2022.100369

Cited by 21 publications

(18 citation statements)

References 6 publications

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“…The Tyndall light scattering effect produced by the nanoparticles formed in the solutions also disappeared, thus providing direct visual evidence of the disassembly of micelles (Figure S5, Supporting Information). The higher dielectric constant and dipole of DMF molecules can facilitate almost 8 times higher carbazole solubility than in IPA [ 31 ] to help disassemble the SAM micelles. In addition, these carbazole‐based SAMs are highly soluble in aprotic solvents with high dielectric constants, such as dimethyl sulfoxide, N , N ‐dimethylacetamide, and N ‐methyl‐2‐pyrrolidone, which are also valid candidates to serve as co‐solvents (Figure S6, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Compact Hole‐Selective Self‐Assembled Monolayers Enabled by Disassembling Micelles in Solution for Efficient Perovskite Solar Cells

Liu,

Bi,

Jiang

et al. 2023

Advanced Materials

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Self‐assembled monolayers (SAMs) have been widely employed as effective hole‐selective layers (HSLs) in inverted perovskite solar cells (PSCs). However, most SAM molecules are amphiphilic in nature and tend to form micelles in the commonly used alcoholic processing solvents. This introduces an extra energetic barrier to disassemble the micelles during the binding of SAM molecules on the substrate surface, limiting the formation of a compact SAM. To alleviate this problem for achieving optimal SAM growth, we develop a co‐solvent strategy to disassemble the micelles of carbazole‐based SAM molecules in the processing solution. This effectively increases the critical micelle concentration to be above the processing concentration and enhances the reactivity of the phosphonic acid anchoring group to allow densely packed SAMs to be formed on ITO. Consequently, the PSCs derived from using MeO‐2PACz, 2PACz, and CbzNaph SAM HSLs showed universally improved performance, with the CbzNaph SAM derived device achieving a champion efficiency of 24.98% and improved stability.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Compact Hole‐Selective Self‐Assembled Monolayers Enabled by Disassembling Micelles in Solution for Efficient Perovskite Solar Cells

Liu,

Bi,

Jiang

et al. 2023

Advanced Materials

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“…Chlorine as an electron-withdrawing heteroatom can appropriately adjust the molecular energy level and dipole for good energy alignment and effective charge selection in both the OSCs and PSCs. On the contrary, carbazole-based molecules are predominantly used in high-performance PSCs benefiting from their matching energy levels with perovskite (VBM: −5.90 eV). ,, However, their deeper energy levels make it challenging to accommodate organic semiconductors (e.g., PM6 HOMO: −5.56 eV) at the same time.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the above-mentioned materials, self-assembled monolayers (SAMs) emerge as new candidates for HSLs in photovoltaic devices and offer great potential in industrial manufacturing due to their compatibility with diverse substrates, easier dopant-free processing procedures, minimum material consumption, low cost, and green-solvent processability. − Structures of SAMs can be easily modified to fit different PSC and OSC systems. For example, Hong et al selected bromine-substituted phenothiazine as the SAM backbone, acting as the HSL in PSCs for the first time.…”

Section: Introductionmentioning

confidence: 99%

A Hole-Selective Self-Assembled Monolayer for Both Efficient Perovskite and Organic Solar Cells

Li,

Liu

et al. 2024

Langmuir

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Self-assembled monolayers (SAMs) emerging as promising hole-selective layers (HSLs) are advantageous for facile processability, low cost, and minimal material consumption in the fabrication of both perovskite solar cells (PSCs) and organic solar cells (OSCs). However, owing to the different nature between perovskites and organic semiconductors, few SAMs were reported to effectively accommodate both PSCs and OSCs at the same time. In this regard, a universally applicable SAM that can accommodate both perovskites and organic semiconductors could be desirable for simplifying cell manufacturing, especially from an industrial perspective. In this work, we designed a SAM, TDPA-Cl by introducing chlorinated phenothiazine as the headgroup and linking with anchor phosphonic acid through a butyl chain. The resulting dense SAM was carefully characterized in terms of molecular bonding, surface morphology, and packing density, and its functions in OSCs and PSCs were discussed from the aspects of interactions with the absorber layer, energy level alignment, and charge-selective dipoles. The PM6:Y6-based OSCs with TDPA-Cl SAM as the HSL showed a superior performance to those with PEDOT:PSS. Furthermore, the universality was proved with an efficiency of 17.4% in the D18:Y6 system. In PSCs, the TDPA-Cl-based devices delivered a better performance of 22.4% than the PTAA-based devices (20.8%) with improved processability and reproducibility. This work represents a SAM with reasonably good compromise between the differing requirements of OSCs and PSCs.

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“…25–27 Considering the challenges associated with the HTLs in inverted PSCs, SAM-based HTLs can adjust the energy level, surface energy, and wettability of the substrate, providing an opportunity to address the main issues. 28…”

Section: Sams As Hole Transport Layers or Modifying Layers For P–i–n-...mentioning

confidence: 99%

Towards cost-efficient and stable perovskite solar cells and modules: utilization of self-assembled monolayers

Cheng

Zhong

2023

Mater. Chem. Front.

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Self-assembled monolayers as emerging hole-selective layers enable high-performance thin-film solar cells

Cited by 21 publications

References 6 publications

Compact Hole‐Selective Self‐Assembled Monolayers Enabled by Disassembling Micelles in Solution for Efficient Perovskite Solar Cells

Compact Hole‐Selective Self‐Assembled Monolayers Enabled by Disassembling Micelles in Solution for Efficient Perovskite Solar Cells

A Hole-Selective Self-Assembled Monolayer for Both Efficient Perovskite and Organic Solar Cells

Towards cost-efficient and stable perovskite solar cells and modules: utilization of self-assembled monolayers

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