Structure-induced optoelectronic properties of phenothiazine-based materials

Revoju, Srikanth; Matuhina, Anastasia; Canil, Laura; Salonen, Henri; Hiltunen, Arto; Abate, Antonio; Vivo, Paola

doi:10.1039/d0tc03421e

Cited by 76 publications

(55 citation statements)

References 109 publications

(177 reference statements)

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“…This value for the Br-2EPT is in good agreement with those reported previously. [35] In addition, numerous reports have indicated that the sulphur can passivate interfacial trap states, suppress charge recombination and inhibit ion migration, thereby enhancing the stability and performance of PSCs. [36,37] Subsequently, electron-withdrawing Br groups were introduced as substituents in the phenothiazine moiety to better align the energy levels with the perovskite materials, by modifying the work function (WF) of the transparent conductive oxide (TCO) substrate through its permanent dipole moment (vide infra).…”

Section: Resultsmentioning

confidence: 99%

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Novel Phenothiazine‐Based Self‐Assembled Monolayer as a Hole Selective Contact for Highly Efficient and Stable p‐i‐n Perovskite Solar Cells

Ullah

Park

Nguyen

et al. 2021

Advanced Energy Materials

102

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PSCs have two typical configurations, regular (n-i-p) and inverted (p-i-n). So far, the highest reported efficiencies of PSCs have been achieved using the n-i-p configuration with a mesoporous scaffold such as, a TiO 2 layer. [11] The mesoporous n-i-p structure usually requires a high temperature thermal treatment, exhibits severe hysteresis behavior and photo-induced degradation. The planar p-i-n architecture, which has no mesoporous scaffold, has attracted growing attention because it offers low temperature fabrication, much less pronounced hysteresis [12] and high stability with no need for dopants in the charge selective layer, which are known to cause degradation. [13] The p-i-n PSCs have also shown superior compatibility in perovskite based tandem solar cells due to lower parasitic absorption loss in the front contact. [14][15][16] Nevertheless, the maximum PCE of p-i-n PSCs still lags behind that of their n-i-p counterparts. This is predominantly the results of lower open circuit voltage and higher non-radiative recombination losses. [17] These losses are dominated by the interfaces of the charge-selective contacts. Extensive efforts have been devoted to improving these interfacial properties. For instance, approaches using ultrathin but conformal organic Recent advances in perovskite solar cells (PSCs) performance have been closely related to improved interfacial engineering and charge selective contacts. Here, a novel and cost-competitive phenothiazine based, self-assembled monolayer (SAM) as a hole-selective contact for p-i-n PSCs is introduced. The molecularly tailored SAM enables an energetically well-aligned interface with the perovskite absorber, with minimized nonradiative interfacial recombination loss, thus dramatically improving charge extraction/transport and device performance. The resulting PSCs exhibit a power conversion efficiency (PCE) of up to 22.44% (certified 21.81%) with an average fill factor close to 81%, which is among the highest efficiencies reported to date for p-i-n PSCs. The new SAM also demonstrates the outstanding operational stability of the PSC, with increasing PCE from 20.3% to 21.8% during continuous maximum power point tracking under a simulated 1 sun illumination for 100 h. The reported findings highlight the great potential of engineered SAMs for the fabrication of stable and high performing PSCs.

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Section: Resultsmentioning

confidence: 99%

“…This value for the Br‐2EPT is in good agreement with those reported previously. [ 35 ] In addition, numerous reports have indicated that the sulphur can passivate interfacial trap states, suppress charge recombination and inhibit ion migration, thereby enhancing the stability and performance of PSCs. [ 36,37 ]…”

Section: Resultsmentioning

confidence: 99%

Novel Phenothiazine‐Based Self‐Assembled Monolayer as a Hole Selective Contact for Highly Efficient and Stable p‐i‐n Perovskite Solar Cells

Ullah

Park

Nguyen

et al. 2021

Advanced Energy Materials

102

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“…Phenothiazine is often used as a donor substituent that adopts a butterfly-type conformation in various optoelectronic materials. [39] (Di)phenothiazinedibenzothiophene-S,S-dioxides 17 a and 18 a exhibited prompt fluorescence and thermally activated delayed fluorescence (TADF) (Figure 8). [40] In contrast, the corresponding 1-methylphenothiazine-substituted derivatives 17 b and 18 b did not exhibit TADF, displaying RTP instead, when the luminophores were dispersed in Zeonex film.…”

Section: Diarylsulfonesmentioning

confidence: 99%

“…Phenothiazine is often used as a donor substituent that adopts a butterfly‐type conformation in various optoelectronic materials [39] . (Di)phenothiazinedibenzothiophene‐ S , S ‐dioxides 17 a and 18 a exhibited prompt fluorescence and thermally activated delayed fluorescence (TADF) (Figure 8).…”

Section: Introductionmentioning

confidence: 99%

Metal‐Free Organic Luminophores that Exhibit Dual Fluorescence and Phosphorescence Emission at Room Temperature

Shimizu

Sakurai

2021

ChemPlusChem

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materials that exhibit dual fluorescence and phosphorescence emission in the solid state at room temperature to produce bimodal steady-state emission spectra. The dual emitters presented herein are categorized into the following six compound classes: (1) difluoroboron diaroylmethanes, (2) diarylketones, (3) diarylsulfones, (4) triazines and pyrimidines, (5) fused phenazines, and (6) N-arylcarbazoles.

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“…[1][2][3][4] One area in which D-p-A systems have been immensely explored is dye sensitized solar cells (DSSCs). [5][6][7][8] Over the last two decades, DSSCs have also captured the interest of green energy scientists as a means of cost-effective solar energy conversion. [9][10][11] Since the pioneering work of Gra ¨tzel and co-workers, extensive endeavors have been made to increase the power conversion efficiencies of DSSCs.…”

Section: Introductionmentioning

confidence: 99%

Through structural isomerism: positional effect of alkyne functionality on molecular optical properties

Nakka

Kushavah

Kumar

et al. 2022

Phys. Chem. Chem. Phys.

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Structure-induced optoelectronic properties of phenothiazine-based materials

Abstract: Phenothiazine (PTZ)-based materials have recently received considerable interest owing to their intriguing optoelectronic properties, low-cost, versatility of functionalization, and commercial availability. The advent of molecular engineering concepts in π-conjugated organic...

Cited by 76 publications

References 109 publications

Novel Phenothiazine‐Based Self‐Assembled Monolayer as a Hole Selective Contact for Highly Efficient and Stable p‐i‐n Perovskite Solar Cells

Novel Phenothiazine‐Based Self‐Assembled Monolayer as a Hole Selective Contact for Highly Efficient and Stable p‐i‐n Perovskite Solar Cells

Metal‐Free Organic Luminophores that Exhibit Dual Fluorescence and Phosphorescence Emission at Room Temperature

Through structural isomerism: positional effect of alkyne functionality on molecular optical properties

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