4-Tert butylpyridine induced MAPbI3 film quality enhancement for improving the photovoltaic performance of perovskite solar cells with two-step deposition route

Dong, Guohua; Ha, Jiao; Qiu, Lele; Fan, Ruiqing; Zhang, Wenzhi; Bai, Liming; Gao, Wanshou; Fu, Meiling

doi:10.1016/j.apsusc.2019.04.069

Cited by 23 publications

(22 citation statements)

References 43 publications

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“…48 TBP also functions as an effective additive to passivate perovskite defects and improve film quality through chemical bonding interaction between N atom of TBP and Pb atom of perovskite to boost the PCE to about 15−17%. 49,50 For direct comparison under our experimental condition, detailed photovoltaic parameters of five kinds of PSCs fabricated with BPY [4,4], BPY[2,2], TBP, and CNP at given 0.15 mol % and control demonstrate that BPY [4,4] is superior to other three functional additives in PSCs as shown in Figure 2a, Figure S1, and Table S1. Better steady-state photoluminescence (PL) property and longer time-resolved PL (TRPL) decay time presented in Figure S2 can support the device performance comparison.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…It can be seen that BPY[4,4] increases light absorption while after certain addition (Figure S10). Generally, enhanced light absorption may be ascribed to better perovskite film quality, which means that the perovskite active layer will absorb more energy photons, without affecting the carrier recombination ability of the perovskite film, and it will lead to an increase in the short-circuit current. − Further steady-state PL spectra in Figure b and Figure S11 also indicate that adding BPY[4,4] results in more strong photoluminescence property than control film because of more effective defect passivation. The increase in fluorescence intensity and fluorescence lifetime indicates that the recombination of carriers in the perovskite is enhanced, indicating that the perovskite active layer is excited to produce more carriers under the action of light, and the increase in carriers affects the short-circuit current improvement and has a positive effect.…”

Section: Results and Discussionmentioning

confidence: 99%

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Symmetrical Conjugated Molecular Additive for Defect Passivation and Charge Transfer Bridge in Perovskite Solar Cells

Xiao

et al. 2021

ACS Appl. Energy Mater.

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Defect passivation of functional additives is an effective approach to suppress the nonradiative recombination centers in perovskite solar cells. Here, a symmetrical conjugated molecular additive (4,4′-bipyridyl, BPY[4,4]) with bilateral nitrogen atoms is employed for effective defect passivation by bonding with uncoordinated Pb2+ cations within perovskite. Meanwhile, π-conjugated BPY[4,4] affords large bridging interaction for better charge carrier transfer pathway between perovskite grains than control, as witnessed by increased electron and hole mobility. Consequently, the device with optimal BPY[4,4] device displays a power conversion efficiency of 20.82% higher than control device of 18.38% and exhibits better long-term thermal stability. It is worth noting that BPY[4,4] has symmetrical and conjugated molecular structures, which benefit from π–π stacking and face-on orientation structure, so it has more advantages than asymmetric and nonconjugated molecular additives, such as charge transfer, defect passivation, and device performance. Our work demonstrates that symmetrical conjugated molecule additives can construct bridged charge transfer channels between perovskite grains as well as effective defect passivation.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: Results and Discussionmentioning

confidence: 99%

Symmetrical Conjugated Molecular Additive for Defect Passivation and Charge Transfer Bridge in Perovskite Solar Cells

Xiao

et al. 2021

ACS Appl. Energy Mater.

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“…Due to strong polarity of N atoms and the interaction between TBP and Pb atoms, the quality of the perovskite film and the grain size were improved. [ 150 ] Li et al [ 151 ] employed n ‐butylammonium bromide (BABr) as a template for the directional growth of perovskite crystals. The introduction of the large organic cation BABr facilitated formation of the intermediate phase, improved crystallinity of the film, and reduced crystal defects.…”

Section: Additive Engineeringmentioning

confidence: 99%

Review of Two‐Step Method for Lead Halide Perovskite Solar Cells

et al. 2022

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The quality of the perovskite film is crucial to the technological breakthrough of perovskite solar cells (PSCs). The two‐step method can facilitate the formation of a perovskite film with high quality and reproducibility. Many milestones have been made in the development of hybrid lead halide PSCs by using the two‐step method, which has a significant impact on their practical application. Herein, the reaction mechanism of the two‐step method including two‐step immersion method and two‐step spin coating method is summarized. The strategies such as component engineering, solvent engineering, and additive engineering of the two‐step method in preparing high‐quality films are introduced systematically and in detail. In addition, current issues of the two‐step method and its applications in lead‐free PSCs, all‐inorganic PSCs, large areas, and tandems are introduced and some suggestions are put forward for future research.

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“…The perovskite absorber layer is deposited using a 2-step method where in the first layer, 100 µL of PbI 2 solution consisting of PbI 2 powder (507 mg) in DMF (1 mL) and tBP (100 µL) is spin coated on the TiO 2 photoanode at 3000 rpm for 30 s then annealed at 100 • C for 10 min. Previous study have emphasised the addition of tBP to enhance the hydrophobicity of PbI 2 and the deposited perovskite absorber [17]. Then, 250 µL of MAI solution consisting of 35 mg MAI powder in 1 mL isopropanol at 4000 rpm for 30 s then annealed at 100 • C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Performance-Enhancing Sulfur-Doped TiO2 Photoanodes for Perovskite Solar Cells

et al. 2022

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High-performance electron transport layer (ETL) anode generally needs to form a uniform dense layer with suitable conduction band position and good electron transport properties. The TiO2 photoanode is primarily applied as the ETL because it is low-cost, has diverse thin-film preparation methods and has good chemical stability. However, pure TiO2 is not an ideal ETL because it lacks several important criteria, such as low conductivity and conduction band mismatch with compositional-tailored perovskite. Thus, TiO2 is an inefficient photo-anode or ETL for high-performance perovskite devices. In this study, sulfur as dopant in the TiO2 photo-anode thin film is used to fabricate solid-state planar perovskite solar cells in relatively high humidity (40–50%). The deposited S-doped thin film improves the power conversion efficiency (PCE) of the device to 6.0%, with the un-doped TiO2 producing a PCE of 5.1% in the best device. Improvement in PCE is due to lower recombination and higher photocurrent density, resulting in 18% increase in PCE (5.1–6.0%).

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4-Tert butylpyridine induced MAPbI3 film quality enhancement for improving the photovoltaic performance of perovskite solar cells with two-step deposition route

Cited by 23 publications

References 43 publications

Symmetrical Conjugated Molecular Additive for Defect Passivation and Charge Transfer Bridge in Perovskite Solar Cells

Symmetrical Conjugated Molecular Additive for Defect Passivation and Charge Transfer Bridge in Perovskite Solar Cells

Review of Two‐Step Method for Lead Halide Perovskite Solar Cells

Performance-Enhancing Sulfur-Doped TiO2 Photoanodes for Perovskite Solar Cells

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