Understanding the effect of antisolvent on processing window and efficiency for large-area flexible perovskite solar cells

Chen, Cong; Jiang, Yue; Feng, Yongliang; Li, Zhuoxi; Cao, Nengjie; Zhou, Guofu; Liu, Junming; Kempa, Krzysztof; Feng, Shien‐Ping; Gao, Jinwei

doi:10.1016/j.mtphys.2021.100565

Cited by 14 publications

(17 citation statements)

References 45 publications

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“…16 However, CB-assisted deposition has been restricted with a narrow processing window because its dripping time has been strictly controlled at the 10th second after spin-coating, greatly hindering its translation from laboratory to industrial applications without sacrificing device performance. 5,17,18 Alternative antisolvents, such as tert-butyl alcohol, 7 anisole, 5,19 and carbonates, 17 have been studied with the objective of widening the antisolvent processing window to overcome this limitation. Despite the effectiveness of these antisolvents, there is still no clear guideline for the appropriate antisolvent selection and mechanism for enhancing the perovskite crystal growth and efficiencies of solar cells.…”

Section: Introductionmentioning

confidence: 99%

“…23−25 However, this seeding technique is effective only when the colloidal seeds are mixed in PbI 2 solution; no perovskite seeds are formed if powder-form perovskite is added into the precursor. According to our previously established theory, 17 as shown in Figure 1a, three stages could be distinguished during the antisolvent-assisted perovskite film fabrication process: (1) in the first 2−5 s, most of the precursor solution is removed by centrifugation; (2) CB antisolvent is added to wash away the residue (i.e., the DMF and DMSO solvent) and form the PbI 2 −DMSO−MAI intermediate phase; and (3) thermal annealing is performed to complete the transition from the intermediate to the perovskite phase. Therefore, except for the influence on the processing window, there is no doubt in the antisolvent determining the crystallizing process of perovskite films as well.…”

Section: Introductionmentioning

confidence: 99%

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Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Chen

Zhou

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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The chlorobenzene (CB) antisolvent is widely used to fabricate high-efficiency perovskite solar cells (PSCs). However, the narrow processing window and the strict volume ratio of a binary mixed solvent limit the fabrication of large-area and high-quality perovskite films. In this work, by systematic investigation of additives with the CB antisolvent, a universal guideline is achieved wherein a small amount of additive with a donor number between 9.0 and 27.0 kcal/mol can significantly widen the antisolvent treating time slot from 2 to 40 s while simultaneously enlarging the processor binary mixed solvent (dimethylformamide/dimethyl sulfoxide) from 7:3 to 0:10. Moreover, this process facilitates the formation of perovskite seeds as templates for perovskite crystal growth, effectively reducing the bulk defects in perovskite films. Finally, the obtained PSCs show remarkable power conversion efficiencies (PCEs) of 22.22 and 19.74% for rigid and flexible devices, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Chen

Zhou

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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“…Another obstacle posed by DMF solvent is the narrow antisolvent dripping window. , The regulation of the process time window appeals to the elaborate control of the solvents’ volatility and viscosity. − Thus, Han et al modulated the ratio of DMSO and GBL and thus controlled the viscosity of the mixed solvent system, contributing to a widened processing window with PCE of 17.6% for PSCs . Mathur et al used a high-viscosity methylammonium propionate (MAP)/ACN/DMSO cosolvent system to prepare PSCs with a PCE of 15.46% and widened dripping window .…”

Section: Introductionmentioning

confidence: 99%

A Nontoxic NFM Solvent for High-Efficiency Perovskite Solar Cells with a Widened Processing Window

Fang

Jiang

Yang

et al. 2022

ACS Appl. Mater. Interfaces

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With the steady industrialization process of the perovskite solar cells (PSCs), the toxicity of the used solvents has become a pivotal issue that needs to be addressed. Especially, the usage of N,N-dimethylformamide (DMF) solvent would pose serious environmental and health concerns. Herein, we have reported a nontoxic solvent N-formylmorpholine (NFM) to replace the toxic DMF and have achieved a higher PCE of 22.78% compared to 21.97% when DMF was adopted. Moreover, with NFM, a widened antisolvent processing window was observed, facilitating the fabrication of PSCs with high reproducibility. This solvent engineering strategy offers an important solution to prepare eco-friendly, efficient, and stable perovskite solar cells.

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“…[ 19 ] Studies have shown that high‐quality perovskite film and additive strategies are effective methods for obtaining long‐term stability of PSCs. [ 20,21 ]…”

Section: Introductionmentioning

confidence: 99%

“…[19] Studies have shown that high-quality perovskite film and additive strategies are effective methods for obtaining long-term stability of PSCs. [20,21] In this work, an oxydic silane coupling agent, vinyl tri (2-methoxy ethoxy) silane (VTMES), was introduced into perovskite/HTL interface to modify the surface of perovskite film. Silane coupling agent is a commonly used additive for enhancing the compatibility of inorganic and organic materials in semiconductor devices.…”

mentioning

confidence: 99%

Enhanced Bending Resistance and Efficiency of Flexible PSCs Derived from Self‐Healing and Passivation Double Function of a Silane Coupling Agent

Lei

Liu

et al. 2022

Adv Materials Inter

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Flexible perovskite solar cells (f‐PSCs) show promising applications because of their lightweight and flexible properties. However, f‐PSCs still suffer from low efficiencies and poor stabilities. Here, vinyl tri (2‐methoxyethoxy) silane (VTMES) is introduced between perovskite and hole transport layer. The oxydic silane coupling agent effectively suppresses PbI2 formation in perovskite by forming PbO bonding, which greatly improves perovskite phase. Kelvin probe force microscopy (KPFM) results demonstrate that p‐type doping is formed in the modified device, which effectively inhibits carrier recombination. The silane coupling agent plays double role in the devices. On one hand, it greatly improves the bending resistance of f‐PSCs due to its excellent self‐healing properties, on the other hand, it obviously suppresses defects and restrains carrier recombination of the devices by facilitating perovskite grain growth. As a result, f‐PSCs with a champion efficiency of 17.01% increased from 15.28% are achieved with high reproducibility. Meanwhile, f‐PSCs present robust bending resistance. Optimal modified devices can maintain 92% of their initial efficiency after 3000 bending cycles, while the control one can only remain 55%. This work paves a new path for f‐PSCs to improve photovoltaic properties and bending resistance by oxydic silane coupling agents.

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Understanding the effect of antisolvent on processing window and efficiency for large-area flexible perovskite solar cells

Cited by 14 publications

References 45 publications

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

A Nontoxic NFM Solvent for High-Efficiency Perovskite Solar Cells with a Widened Processing Window

Enhanced Bending Resistance and Efficiency of Flexible PSCs Derived from Self‐Healing and Passivation Double Function of a Silane Coupling Agent

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