Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells

Ma, Ke; Atapattu, Harindi R.; Zhao, Qiuchen; Gao, Yao; Finkenauer, Blake P.; Wang, Kang; Chen, Ke; Park, Somin; Coffey, Aidan H.; Zhu, Chenhui; Huang, Libai; Graham, Kenneth R.; Mei, Jianguo; Dou, Letian

doi:10.1002/adma.202100791

Cited by 128 publications

(134 citation statements)

References 44 publications

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“…As no experimental values were available in the literature to model interface recombination, the parameters were set to fit the experimental JÀV curve from other studies. [29,30] Note that for simplicity we assumed that the perovskite used in the simulation is weakly p-type, although whether perovskites are n-type or p-type is still a debate. [31] 3.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…Therefore, the model parameters must be carefully set and adjusted to reproduce the experimental data. [29,30] Accordingly, we first calibrated and verified our physical PSC models by fitting to experimental data.…”

Section: Model Calibrationmentioning

confidence: 99%

“…Thus, the electrons generated in the absorber will transfer from the occupied E C of the perovskite to the E C of SnO 2 ETL and then, to FTO to complete the circuit. At the front side, the valence band edge [29] and pÀiÀn [30] structure.…”

Section: Cell Band Structure Analysismentioning

confidence: 99%

“…To verify the complete set of parameters used to model the reference cell, we have calibrated two different types of PSCs, including a normal nÀiÀp structure and an inverted pÀiÀn structure, by fitting JÀV curves of the simulated PSCs to those fabricated in other studies. [29,30] Figure 1b compares the simulated JÀV curves after parameters calibration with the measured ones. The close agreement of the simulated and measured curves ensures the validity of the simulation results.…”

Section: Model Calibrationmentioning

confidence: 99%

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Highly Efficient and Industrially Feasible Interdigitated Back‐Contact Perovskite Solar Cells with Front Carrier Transport Layers Selected Using 2D Simulation

Lin

Xiong

et al. 2021

Solar RRL

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Interdigitated back‐contact (IBC) perovskite solar cells (PSCs) have great potential for highly efficient and low‐cost solar energy conversion. However, their full potential has not been achieved. In particular, there is no practically available front surface and rear contact design for IBC‐PSCs as for the conventional crystalline silicon IBCs, which propose challenges in realizing high efficiency. Herein, innovative quasi‐interdigitated back‐contact (QIBC) PSC designs that enhance the effective lateral transport of carriers are proposed and therefore a realistic wide pitch for back contacting in the range of hundreds of micrometers is allowed. The novel design features implementing an appropriate conductive and well‐passivated carrier transport layer, referred to as a front‐carrier transport layer (FCTL), on the front surface of the QIBC‐PSC. Technology computer‐aided design optical/device simulations are used to investigate the function of the FCTL in increasing the cell performance and achieve 23.23% of power conversion efficiency (PCE) after FCTL design optimizations for a QIBC‐PSC with a rear contact pitch of 200 μm. Further improvement of the PCE over 25% can be potentially achievable by improving the film and passivation quality. This work opens up a new approach to fabricate realistic highly efficient IBC‐PSCs.

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Section: Simulation Methodsmentioning

confidence: 99%

Section: Model Calibrationmentioning

confidence: 99%

Section: Cell Band Structure Analysismentioning

confidence: 99%

Section: Model Calibrationmentioning

confidence: 99%

See 2 more Smart Citations

Highly Efficient and Industrially Feasible Interdigitated Back‐Contact Perovskite Solar Cells with Front Carrier Transport Layers Selected Using 2D Simulation

Lin

Xiong

et al. 2021

Solar RRL

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show abstract

“…[9][10][11][12] They are highly reactive to water and oxygen, thus inducing the degradation of the perovskite film and reducing the stability of PSCs. [13][14][15] These defects at grain boundaries acting as the recombination and trap-state centers are detrimental for the cell performance. [16][17][18] Thus, effective management of perovskite grain boundaries is vitally important for maximizing the performance and stability of PSCs.…”

mentioning

confidence: 99%

Homogeneously Large Polarons in Aromatic Passivators Improves Charge Transport between Perovskite Grains for >24 % Efficiency in Photovoltaics

Zhao

Wang

et al. 2022

Angewandte Chemie

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Aromatic passivators, such as porphyrin, with large π-backbones have attracted considerable attention to boost the charge carrier in polycrystalline perovskite films, thus enabling the fabrication of efficient and stable perovskite solar cells (PSCs). However, they often selfassemble into supramolecules that probably influence the charge-transfer process in the perovskite grain boundary. Here, by doping a monoamine Cu porphyrin into perovskite films, two porphyrin-based self-assembled supramolecules were successfully prepared between perovskite grains. Crystal structures and theoretical analyses reveal the presence of a stronger interaction between the amine units and the central Cu ions of neighbouring porphyrins in one of the supramolecules. This has a modified effect on the dipole direction of the porphyrins to be quantized as homogeneously large polarons (HLPs) in a periodic lattice. The porphyrin supramolecules can stabilize perovskite grain boundaries to greatly improve the stability of PSCs, while the HLPs-featured supramolecule facilitates hole transport across perovskite grains to remarkably increase the cell performance to as high as 24.2 %. This work proves that the modulation of the intermolecular interaction of aromatic passivators to yield HLPs is crucial for the cascaded acceleration of charge transport between perovskite grains. Organic-inorganic hybrid perovskite solar cells (PSCs)have attracted enormous attention because of their excellent power conversion efficiencies (PCEs) and low cost. [1][2][3][4] In recent years, the best PCE of PSCs has developed rapidly and has exceeded 25 %, approaching the single-junction Shockley-Queisser (SQ) limit. [5][6][7][8] A polycrystalline perovskite film fabricated by low-temperature solution-processed growth inevitably forms a large number of grain boundaries with a high defect density. [9][10][11][12] They are highly reactive to water and oxygen, thus inducing the degradation of the perovskite film and reducing the stability of PSCs. [13][14][15] These defects at grain boundaries acting as the recombination and trap-state centers are detrimental for the cell performance. [16][17][18] Thus, effective management of perovskite grain boundaries is vitally important for maximizing the performance and stability of PSCs. [19][20][21] A series of functional organic small molecules has been employed to passivate the perovskite defects and increase the performance and stability of PSCs. [22][23][24] However, these molecules have a high degree of volatility and high diffusion coefficients, resulting in poor stability under harsh environments, such as strong light, high temperature, and electric fields. [17,25] Stable aromatic passivators should be potential candidates to decorate perovskite films to promote the efficient charge transport across perovskite grains, [26][27][28][29][30][31] and/ or contribute to the surface band edges to influence the charge carrier dynamics, [32] thus leading to the fabrication of efficient and stable PSCs. It is worth noting that it is...

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Ion Migration in Halide Perovskites

Yuan¹,

Zhao²,

Shao³

et al. 2022

Perovskite Materials and Devices

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Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells

Cited by 128 publications

References 44 publications

Highly Efficient and Industrially Feasible Interdigitated Back‐Contact Perovskite Solar Cells with Front Carrier Transport Layers Selected Using 2D Simulation

Highly Efficient and Industrially Feasible Interdigitated Back‐Contact Perovskite Solar Cells with Front Carrier Transport Layers Selected Using 2D Simulation

Homogeneously Large Polarons in Aromatic Passivators Improves Charge Transport between Perovskite Grains for >24 % Efficiency in Photovoltaics

Ion Migration in Halide Perovskites

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