Vertical phase segregation suppression for efficient FA-based quasi-2D perovskite solar cells via HCl additive

Li, Yuepeng; Li, Haijin; Tian, Liuwen; Wang, Qiyun; Wu, Fengkai; Zhang, Fu; Du, Lin; Huang, Yuelong

doi:10.1007/s10854-020-03775-z

Cited by 12 publications

(13 citation statements)

References 41 publications

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“…Although the solutions were nominally prepared as a single phase of n = 3, there is a strong exciton peak around 570 nm assigned to the n = 2 phase for all (BA) 2 (FA) 2 Pb 3 I 10 films at room temperature, which is consistent with the reported work . The excitonic transition of the n = 3 phase, which should be peaked around 635 nm, is not shown in clarity at room temperature . The nonzero O.D.…”

Section: Resultssupporting

confidence: 87%

“…Using precursor solution with a low concentration of 0.25 M, the power conversion efficiency (PCE) of the champion device in the group of device B (0.25hot) is 7.33%, with a twice higher short-circuit current density ( J sc ) and bigger open-circuit voltage ( V oc ) than that of devices A. To the best of our knowledge, 7.33% is the highest value for (BA) 2 (FA) n −1 Pb n I 3 n +1 and is among the highest reported values for FA based quasi-2D perovskite solar cells with n < 5. , …”

Section: Resultsmentioning

confidence: 87%

“…To the best of our knowledge, 7.33% is the highest value for (BA) 2 (FA) n−1 -Pb n I 3n+1 and is among the highest reported values for FA based quasi-2D perovskite solar cells with n < 5. 17,25 However, the devices fabricated by hot-cast showed worse reproducibility than that fabricated using the RT substrate, as shown in SI: Figure S2, which is a histogram of the PCE values of the devices fabricated from 0.25 M precursor solution. On the other hand, for the high concentration of 1 M, the hot-cast technique results in the best PCE of 3.78% (averagely, 3.5%), which did not increase the PCE significantly compared to 2.91% (averagely, 2.59%) of device C casted on the RT substrate using the same precursor solution.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the replacement of MA cation with a slightly larger FA cation was used to narrow the band gap and to enhance the stability, which has been demonstrated in 3D perovskites. − With efforts done in controlling the crystallization process, a perovskite solar cell based on FAPbI 3 with a PCE of 24.8% has been reported . However, such efforts have not been applied in FA based 2D perovskites to pursue optimized optoelectronic properties. ,,− Therefore, although utilization of FA cation supplies more versatility to achieve an optimal balance between PCE and stability for commercialization, the FA based 2D perovskite solar cell is still not as efficient as the MA based one. ,,, …”

Section: Introductionmentioning

confidence: 99%

“…6,14,22−24 Therefore, although utilization of FA cation supplies more versatility to achieve an optimal balance between PCE and stability for commercialization, the FA based 2D perovskite solar cell is still not as efficient as the MA based one. 14,22,25,26 In this work, we fabricated the PSCs and films using (BA) 2 (FA) 2 Pb 3 I 10 without thermal annealing. The concentration of the precursor solution is 0.25 mol/L (M) and 1 mol/ L (M) based on the molar number of PbI 2 , respectively.…”

Section: Introductionmentioning

confidence: 99%

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Excitonic Solar Cells Using 2D Perovskite of (BA)₂(FA)₂Pb₃I₁₀

Yang

et al. 2021

J. Phys. Chem. C

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Using substrates at room temperature or at 110 °C, two-dimensional (2D) perovskite films and solar cells using mixed butylammonium (BA) and formamidinium (FA) cations, i.e., (BA) 2 (FA) n−1 Pb n I 3n+1 (n = 3 nominally), with the same molar ratio of components, but two concentrations of 0.25 mol/L (M) and 1.0 mol/L (M) based on PbI 2 , are fabricated with adding thiourea in the precursor solution, respectively. No matter what the substrate temperature is, the 1.0 M concentration of solution results in more preferential out of plane alignment with respect to the contacts and larger crystalline grain size than that from the 0.25 M solution. However, devices from the 0.25 M solution using the hot-cast technique present better performance averagely, with the best power conversion efficiency (PCE) of 7.33%. In incident-photon-tocurrent efficiency (IPCE) spectra of devices from the 0.25 M solution, we observe the dominant contribution from exciton absorption, which is lacking in devices from the 1 M solution. Our work demonstrates the highest PCE reported for mixed BA and FA based 2D perovskite solar cells with n < 5 and manifests that the effective exciton dissociation will be crucial for FA based 2D perovskite solar cells.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Excitonic Solar Cells Using 2D Perovskite of (BA)₂(FA)₂Pb₃I₁₀

Yang

et al. 2021

J. Phys. Chem. C

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Charge‐Carrier Transport in Quasi‐2D Ruddlesden–Popper Perovskite Solar Cells

Yan

et al. 2022

Advanced Materials

116

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In recent years, 2D Ruddlesden–Popper (2DRP) perovskite materials have been explored as emerging semiconductor materials in solar cells owing to their excellent stability and structural diversity. Although 2DRP perovskites have achieved photovoltaic efficiencies exceeding 19%, their widespread use is hindered by their inferior charge‐carrier transport properties in the presence of diverse organic spacer cations, compared to that of traditional 3D perovskites. Hence, a systematic understanding of the carrier transport mechanism in 2D perovskites is critical for the development of high‐performance 2D perovskite solar cells (PSCs). Here, the recent advances in the carrier behavior of 2DRP PSCs are summarized, and guidelines for successfully enhancing carrier transport are provided. First, the composition and crystal structure of 2DRP perovskite materials that affect carrier transport are discussed. Then, the features of 2DRP perovskite films (phase separation, grain orientation, crystallinity kinetics, etc.), which are closely related to carrier transport, are evaluated. Next, the principal direction of carrier transport guiding the selection of the transport layer is revealed. Finally, an outlook is proposed and strategies for enhancing carrier transport in high‐performance PSCs are rationalized.

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Oriented Low‐n Ruddlesden‐Popper Formamidinium‐Based Perovskite for Efficient and Air Stable Solar Cells

Kong

Zeng

et al. 2022

Advanced Energy Materials

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The relatively lower crystallinity and random orientation of quantum well structures hinder carrier transport and limit the performance of formamidinium (FA) based low‐n 2D perovskite devices. In this work, the crystallization and quantum well orientation are fine tuned to achieve efficient low‐n FA based Ruddlesden–Popper perovskite solar cells. The effects of different ionic additives on the crystallization, orientation, and photovoltaic performance of FA based low‐n 2D perovskites are comparatively investigated. It is found that NH4+ and SCN− can significantly retard the heterogeneous crystallization of low‐n phases in the intermediate state, and drive the templated growth of quantum well structure with vertical orientation. The optimized photovoltaic device based on (BA)2(FA)3Pb4I13 achieved a power conversion efficiency (PCE) of 18.14%, setting the highest record for FA‐based low‐n 2D perovskite solar cells as far as it is known (average n = 4). The unencapsulated device exhibited excellent stability and maintained 93.3% of its original PCE at 85 °C, and 86.3% at 1 Sun illumination after 720 h in humid ambient condition.

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Vertical phase segregation suppression for efficient FA-based quasi-2D perovskite solar cells via HCl additive

Cited by 12 publications

References 41 publications

Excitonic Solar Cells Using 2D Perovskite of (BA)₂(FA)₂Pb₃I₁₀

Excitonic Solar Cells Using 2D Perovskite of (BA)₂(FA)₂Pb₃I₁₀

Charge‐Carrier Transport in Quasi‐2D Ruddlesden–Popper Perovskite Solar Cells

Oriented Low‐n Ruddlesden‐Popper Formamidinium‐Based Perovskite for Efficient and Air Stable Solar Cells

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Vertical phase segregation suppression for efficient FA-based quasi-2D perovskite solar cells via HCl additive

Cited by 12 publications

References 41 publications

Excitonic Solar Cells Using 2D Perovskite of (BA)2(FA)2Pb3I10

Excitonic Solar Cells Using 2D Perovskite of (BA)2(FA)2Pb3I10

Charge‐Carrier Transport in Quasi‐2D Ruddlesden–Popper Perovskite Solar Cells

Oriented Low‐n Ruddlesden‐Popper Formamidinium‐Based Perovskite for Efficient and Air Stable Solar Cells

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Excitonic Solar Cells Using 2D Perovskite of (BA)₂(FA)₂Pb₃I₁₀

Excitonic Solar Cells Using 2D Perovskite of (BA)₂(FA)₂Pb₃I₁₀