Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Yan, Kangrong; Li, Chang‐Zhi

doi:10.1002/macp.201900084

Cited by 15 publications

(14 citation statements)

References 104 publications

(206 reference statements)

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“…Meanwhile, the gap state of DOS is almost eliminated for ionic bonding, which indicates a facilitated charge transfer between the perovskite and fulleropyrrolidium iodide. 28,46 This is further confirmed by the Bader charge analysis results that charge transfer between the ionic fullerene and perovskite surface is about 0.14 electrons per fullerene molecule, compared with negligible transfer between the fulleropyrrole and FAPbI 3 . Similar results can be readily observed in an increase of wave function overlap that bridges the trap states induced by both positive and negative charge defects (Figure 2e).…”

supporting

confidence: 63%

Unravelling the Mechanism of Ionic Fullerene Passivation for Efficient and Stable Methylammonium-Free Perovskite Solar Cells

Fan

Cui

et al. 2020

ACS Energy Lett.

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Despite having attractive stability over the volatile methylammonium (MA) cation, double-cation (Cs, FA) perovskite solar cells are largely overlooked because of their inferior performance compared to MA-based devices. Among all the device engineering strategies, surface passivation represents a promising approach to acquire improved performance. However, effective passivation strategies have not yet been developed for attaining efficiencies of MA-free cells close to their theoretical limit. Herein, fullerene passivators with different binding groups are investigated to establish relationships between molecule structure and perovskite surface properties. It is found that surface treatment with bis-fulleropyrrolidium iodide (bFPI) can have strong interaction with charged defects, leading to effective defect passivation and favorable band-bending at the interface. The resulting bFPI-treated device shows significantly reduced defect density as well as accelerated electron extraction from perovskite into the cathode. Consequently, the MA-free device exhibits an efficiency of 21.1% with long-term environmental stability.

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supporting

confidence: 63%

Unravelling the Mechanism of Ionic Fullerene Passivation for Efficient and Stable Methylammonium-Free Perovskite Solar Cells

Fan

Cui

et al. 2020

ACS Energy Lett.

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“…The UV–vis spectra already showed charge transfer character of the complex formation. Meanwhile, some recent literature showed that large, electron-deficient aromatic systems could facilitate an anion-induced electron transfer process. ,− We wondered if this process could occur in our system with that the electron transfer from N 3 – to the BTI cage 4 produces radical components 4 •– and N 3 • . To check this possibility, some preliminary EPR experiments were performed to probe the possible radical species.…”

mentioning

confidence: 98%

Benzene Triimide Cage as a Selective Container of Azide

Tuo

Wang

et al. 2019

Org. Lett.

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Benzene triimide (BTI, or mellitic triimide) is a C 3-symmetric backbone with a highly electron-deficient, extended π surface and three easy functionalization sites. Here, we report the first BTI-based cage composed of two face-to-face BTIs pillared by three m-xylylene spacers and efficient and selective binding of azide through cooperative anion−π interactions. The cage was easily synthesized in two steps from benzene triimide. Crystal structures showed that the two BTI planes can be separated at about 5–6 Å and form a well-defined electron-deficient cavity. Among a series of anions tested, the cage was found able to bind N3 –, SCN–, and I–. In particular, the binding toward N3 – is very strong (K a = 11098 ± 46 M–1) and highly selective, over 150 and 250 times higher than SCN– and I–, respectively. The control single BTI, however, showed only very weak binding (K a < 5 M–1). The crystal structure showed that N3 – is tightly trapped within the cavity through multiple, very short anion−π interactions. The slow enter–release of N3 – from the cavity was observed in the NMR. The charge-transfer and electron-transfer character of the interactions was also discussed.

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“…An NIR active layer of the PM6:Y6 blend (SI) is employed . Bis-FIMG (SI) is a self-doped conductive bifunctional fulleropyrrolidinium iodide as an electron-transport layer. , The F–P resonant-cavity electrode consists of a Ag–TeO 2 –Ag structure, wherein TeO 2 with a refractive index ( n ) of 2.2, as the dielectric material, ensures good light transmission at the metal/dielectric interfaces; meanwhile, its near-zero extinction coefficient ( k ) minimizes the intrinsic absorption in the F–P electrode. The n and k values of the active layer and TeO 2 are presented in Figure S1.…”

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confidence: 99%

Semitransparent Organic Solar Cells with Vivid Colors

et al. 2020

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Organic solar cells (OSCs) with visible transparency and vivid colors are promising for deployment in building-integrated photovoltaics (BIPVs), yet significant challenges remain to be addressed for not only balancing the trade-off between the photovoltaic and optical properties but also controlling the bandpass of visible transmittance for the coloration of semitransparent OSCs (ST-OSCs). Herein ST-OSCs with vivid colors are successfully developed by employing one fixed active blend in the rationally designed device layout with a high-quality Fabry−Peŕot electrode. With the assistance of optical simulation, vividly colorful ST-OSCs have been obtained with power conversion efficiency of >14% and maximum transmittance up to 31%. Overall, this study provides new access to OSCs with promising features as BIPVs.

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Solution‐Processable Conductive Organics via Anion‐Induced n‐Doping and Their Applications in Organic and Perovskite Solar Cells

Cited by 15 publications

References 104 publications

Unravelling the Mechanism of Ionic Fullerene Passivation for Efficient and Stable Methylammonium-Free Perovskite Solar Cells

Unravelling the Mechanism of Ionic Fullerene Passivation for Efficient and Stable Methylammonium-Free Perovskite Solar Cells

Benzene Triimide Cage as a Selective Container of Azide

Semitransparent Organic Solar Cells with Vivid Colors

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