2D or not 2D? Selectively formed low-dimensional perovskitoids based on chiral organic cation to passivate perovskite solar cells

Huang, Yongjun; Luo, Hao; Su, Kuo-Lan; Chen, Wentao; Sui, Guomin; Liang, Lusheng; Zhang, Bao; Song, Jian; Gao, Peng

doi:10.1016/j.apmt.2022.101550

Cited by 8 publications

(3 citation statements)

References 56 publications

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“…This low-dimensional phase, with larger structures visible via SEM, over the 3D perovskite matrix, lowers the density of defects, stabilizing the bulk 3D perovskite structure. [53] This, in turn, reduces trap-assisted recombination which is critical for efficient carrier collection in indoor low-light conditions since the photogeneration rate of carriers is low. [23] The overall result is a considerable enhancement in device performance.…”

Section: Perovskite Layer Characterizationmentioning

confidence: 99%

Highly Efficient Flexible Perovskite Solar Cells on Polyethylene Terephthalate Films via Dual Halide and Low‐Dimensional Interface Engineering for Indoor Photovoltaics

Skafi,

Xu,

Mottaghitalab

et al. 2023

Solar RRL

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Flexible perovskite solar cells are lightweight, bendable, and applicable to curved surfaces. Polyethylene terephthalate (PET) has become the substrate of choice compared to other plastic substrates like polyethylene naphthalate. PET is not only stable but also much cheaper to manufacture, an important factor for photovoltaics (PV). Herein, highly efficient devices on PET are demonstrated using a dual low‐temperature (≤100 °C) approach, first by anion mixing (replacing I with Br) of the lead‐containing perovskite composition, increasing bandgap (42% improvement), and then by interfacial engineering with tetrabutylammonium bromide (TBAB) (a further 26% improvement), reaching efficiencies of 28.9% at 200 lx and a record 32.5% at 1000 lx. The TBA+ cation intercalates into the structure, substituting formamidinium cations at the perovskite/TBAB interface, inducing the formation of large‐sized, lower dimensional structures over the 3D perovskite matrix. The resulting PV cell has 1.4 times higher carrier lifetime, one order of magnitude lower leakage currents, and 3 times lower defect densities, suppressing recombination. Importantly, stability (ISOS‐D1 protocol) improves by more than double with treatment. Highly efficient and stable cells on PET films enable seamless integration with wearable, portable, smart building, and Internet of Things electronic devices, expanding the reach of indoor applications.

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Section: Perovskite Layer Characterizationmentioning

confidence: 99%

Highly Efficient Flexible Perovskite Solar Cells on Polyethylene Terephthalate Films via Dual Halide and Low‐Dimensional Interface Engineering for Indoor Photovoltaics

Skafi,

Xu,

Mottaghitalab

et al. 2023

Solar RRL

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“…For instance, depositing large organic ligands on the surface of the perovskite layer to form 2D perovskite can benefit the device's performance via combined passivation mechanisms. [33][34][35][36] Additionally, Lewis acid-base coordination was used to circumvent various undercoordinative chemical defects in perovskite. [37][38][39][40] With the rapid development of PSCs, more multifunctional passivators that can take effect on more than one type of defect via simplified procedures were intentionally developed.…”

Section: Introductionmentioning

confidence: 99%

Auxiliary Buried‐Interface Passivation Toward Stable and Low‐Recombination‐Loss Perovskite Photovoltaics

Li,

Wang,

et al. 2023

Small Science

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Defects occur in the bulk perovskite and heterojunction interfaces of perovskite solar cells (PSCs). While additive and interface engineering are commonly used to passivate defects within the perovskite phase and at the interface, the interconnections between these two strategies have not been fully explored. This study introduces an auxiliary passivation approach for enhancing the performance of PSCs by passivating both the perovskite phase and the buried interface using succinimide (SID), referred to as the multilayer passivation (MLP) strategy. By adding SID to a lead iodide precursor solution and depositing it on tin oxide film, the remarkable ability of SID to coordinate with Pb2+ through Lewis‐base coordination and bind the iodide ion with hydrogen bonds is demonstrated, thereby reducing defects within the perovskite and suppressing nonradiative recombination. Additionally, SID could passivate oxygen vacancy and hydroxyl defects on the SnO2 surface, facilitating carrier separation and extraction. This MLP strategy enables us to achieve a power conversion efficiency (PCE) of 24.47% based on a two‐step process. Moreover, the unencapsulated devices maintain a PCE of 82% at 20 °C with 30% relative humidity after 7000 h. Overall, this study highlights the unparalleled potential of MLP strategy for enhancing the performance of PSCs.

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“…[21,22] Another strategy for passivation is the introduction of low-dimensional perovskites in the 3D perovskite system. [23] Following this approach, the passivation of defects can be achieved, and the intrinsic stability issues of the 3D MAPI structure can be addressed. Therefore, passivated and mixed-dimensional perovskite solar cells (PSCs) have been fabricated using small organic molecular spacers.…”

Section: Introductionmentioning

confidence: 99%

A Novel Multi‐Functional Thiophene‐Based Organic Cation as Passivation, Crystalline Orientation, and Organic Spacer Agent for Low‐Dimensional 3D/1D Perovskite Solar Cells

Semerci

Buyruk

Emin

et al. 2023

Advanced Optical Materials

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Recently, the mixed‐dimensional (3D/2D or 3D/1D) perovskite solar cells using small organic spacers have attracted interest due to their outstanding long‐term stability. Here, a new type of thiophene‐based organic cation 2‐(thiophene‐2yl‐)pyridine‐1‐ium iodide (ThPyI), which is used to fabricate mixed‐dimensional 3D/1D perovskite solar cells, is presented. The ThPyI‐based 1D perovskitoid is applied as a passivator on top of a 3D methyl ammonium lead iodide (MAPI) to fabricate surface‐passivated 3D/1D perovskite films or added alone into the 3D perovskite precursor to generate bulk‐passivated 3D MAPI. The 1D perovskitoid acts as a passivating agent at the grain boundaries of surface‐passivated 3D/1D, which improves the power conversion efficiency (PCE) of the solar cells. Grazing incidence wide‐angle X‐ray scattering (GIWAXS) studies confirm that ThPyI triggers the preferential orientation of the bulk MAPI slabs, which is essential to enhance charge transport. Champion bulk‐passivated 3D and surface‐passivated 3D/1D devices yield 14.10% and 19.60% PCE, respectively. The bulk‐passivated 3D offers favorable stability, with 84% PCE retained after 2000 h without encapsulation. This study brings a new perspective to the design of organic spacers having a different binding motif and a passivation strategy to mitigate the impact of defects in hybrid 3D/1D perovskite solar cells.

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2D or not 2D? Selectively formed low-dimensional perovskitoids based on chiral organic cation to passivate perovskite solar cells

Cited by 8 publications

References 56 publications

Highly Efficient Flexible Perovskite Solar Cells on Polyethylene Terephthalate Films via Dual Halide and Low‐Dimensional Interface Engineering for Indoor Photovoltaics

Highly Efficient Flexible Perovskite Solar Cells on Polyethylene Terephthalate Films via Dual Halide and Low‐Dimensional Interface Engineering for Indoor Photovoltaics

Auxiliary Buried‐Interface Passivation Toward Stable and Low‐Recombination‐Loss Perovskite Photovoltaics

A Novel Multi‐Functional Thiophene‐Based Organic Cation as Passivation, Crystalline Orientation, and Organic Spacer Agent for Low‐Dimensional 3D/1D Perovskite Solar Cells

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