Multifunctional Benzoquinone Additive for Efficient and Stable Planar Perovskite Solar Cells

Qin, Chuanjiang; Matsushima, Toshinori; Fujihara, Takashi; Adachi, Chihaya

doi:10.1002/adma.201603808

Cited by 140 publications

(120 citation statements)

References 41 publications

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“…As shown in Figure b, the peak near 8.78 ppm for the FAI solution w TPFPB additive is also split into two peaks similar to the splitting observed in the perovskite solution w TPFPB. The splitting of FA + protons into two new signals has also been observed by other research groups and us, and it is ascribed to the strong interaction between amino group (—NH 2 ) and TPFPB, as confirmed by very early reports . To further confirm the existence of F—H hydrogen bonds between TPFPB and FAI, we also measured the 19 F NMR spectra of TPFPB and TPFPB+FAI in the DMSO solution (Figure c).…”

Section: Resultssupporting

confidence: 83%

Novel Surface Passivation for Stable FA_0.85MA_0.15PbI₃ Perovskite Solar Cells with 21.6% Efficiency

et al. 2019

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In planar perovskite solar cells (PSCs), defect‐induced recombination at the interface between the perovskite and hole transport layer (HTL) leads to a large potential loss and performance deterioration. Therefore, an effective method for improving interfacial properties is critical to boost the performance and stability of PSCs. Herein, a novel surface engineering technology is reported for passivating the perovskite surface with the polyfluoro organic compound tris(pentafluorophenyl)boron (TPFPB), which can yield large perovskite grains, reduced defect densities, and improved charge transport and phase stability for the perovskite film, and enhanced power conversion efficiency (PCE) and stability for PSCs. Using this strategy, a champion FA0.85MA0.15PbI3 perovskite cell achieves a high PCE of 21.6% as well as significantly improved air and light stabilities. This work demonstrates that TPFPB is a promising material for crystallization control and defect passivation and paves a new path for mitigating defects and further increasing the performance of planar PSCs.

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Section: Resultssupporting

confidence: 83%

Novel Surface Passivation for Stable FA_0.85MA_0.15PbI₃ Perovskite Solar Cells with 21.6% Efficiency

et al. 2019

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“…[14] By decreasing the concentration of the lead ion species used during perovskite film formation, the concentration of defect precursor could be reduced in solutions. [15] By virtue of the weak reduction properties of a benzoquinone additive, we were able to suppress the formation of metallic lead and effectively extend the lifetime of the PSCs. [12] Through systematic experimental studies, we showed that Frenkel defects are detrimental to the stability of PSCs and that metallic lead related vacancies are a possible intrinsic origin of carrier traps.…”

Section: Doi: 101002/advs201801079mentioning

confidence: 99%

“…[11,12,15] Since this phase-transition temperature is much lower than the operating temperature of PSCs in naturally occurring terrestrial environments, the influence of the low-temperature phase transition on device performance should be negligible. [11,12,15] Since this phase-transition temperature is much lower than the operating temperature of PSCs in naturally occurring terrestrial environments, the influence of the low-temperature phase transition on device performance should be negligible.…”

Section: Doi: 101002/advs201801079mentioning

confidence: 99%

The Relation of Phase‐Transition Effects and Thermal Stability of Planar Perovskite Solar Cells

et al. 2018

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A power conversion efficiency of over 20% has been achieved in CH3NH3PbI3‐based perovskite solar cells (PSC), however, low thermal stability associated with the presence of a phase transition between tetragonal and cubic structures near room temperature is a major issue that must be overcome for future practical applications. Here, the influence of the phase transition on the thermal stability of PSCs is investigated in detail by comparing four kinds of perovskite films with different compositions of halogen atoms and organic components. Thermally stimulated current measurements reveal that a large number of carrier traps are generated in solar cells with the perovskite CH3NH3PbI3 as a light absorber after operation at 85 °C, which is higher than the phase‐transition temperature. Electrochemical impedance spectroscopy measurements further exclude effects of a possible morphology change on the formation of carrier traps. These carrier traps are detrimental to the thermal stability. The thermogravimetric analysis does not show a decomposition for any of the materials in the temperature range relevant for operation. The perovskite alloys do not have this phase transition, resulting in effectively suppressed formation of carrier traps. PSCs with improved thermal stability under the standard thermal cycling test are demonstrated.

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“…However, the perovskite films consisting of polycrystalline micro–nanograins are usually prepared by the solution processing methods, which inevitably introduce many defects into the grain boundaries and surface of perovskite films. In addition, due to the low thermal stability of CH 3 NH 3 PbI 3 , thermal annealing (typically ≈100 °C) can cause nonstoichiometry in composition, and also decompose CH 3 NH 3 PbI 3 to PbI 2 on the surface and at the grain boundaries of polycrystalline films, where the unsaturated or undercoordinated Pb ions are most frequently found . Although a certain content of PbI 2 distributed into the perovskite layers and grain boundaries result in the reduced hysteresis and ionic migration, the uncontrollable formation and unpredictable location of PbI 2 also lead to the wide variance in terms of photovoltaic performance, reproducibility, and device stability .…”

Section: Introductionmentioning

confidence: 99%

Goethite Quantum Dots as Multifunctional Additives for Highly Efficient and Stable Perovskite Solar Cells

Chen

Luo

Liu

et al. 2019

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Minimization of defects and ion migration in organic–inorganic lead halide perovskite films is desirable for obtaining photovoltaic devices with high power conversion efficiency (PCE) and long‐term stability. However, achieving this target is still a challenge due to the lack of efficient multifunctional passivators. Herein, to address this issue, n‐type goethite (FeOOH) quantum dots (QDs) are introduced into the perovskite light‐absorption layer for achieving efficient and stable perovskite solar cells (PSCs). It is found that the iron, oxygen, and hydroxyl of FeOOH QDs can interact with iodine, lead, and methylamine, respectively. As a result, the crystallization kinetics process can be retarded, thereby resulting in high quality perovskite films with large grain size. Meanwhile, the trap states of perovskite can be effectively passivated via interaction with the under‐coordinated metal (Pb) cations, halide (I) anions on the perovskite crystal surface. Consequently, the PSCs with FeOOH QDs achieve a high efficiency close to 20% with negligible hysteresis. Most strikingly, the long‐term stability of PSCs is significantly enhanced. Furthermore, compared with the CH3NH3PbI3‐based device, a higher PCE of 21.0% is achieved for the device assembled with a Cs0.05FA0.81MA0.14PbBr0.45I2.55 perovskite layer.

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Multifunctional Benzoquinone Additive for Efficient and Stable Planar Perovskite Solar Cells

Cited by 140 publications

References 41 publications

Novel Surface Passivation for Stable FA_0.85MA_0.15PbI₃ Perovskite Solar Cells with 21.6% Efficiency

Novel Surface Passivation for Stable FA_0.85MA_0.15PbI₃ Perovskite Solar Cells with 21.6% Efficiency

The Relation of Phase‐Transition Effects and Thermal Stability of Planar Perovskite Solar Cells

Goethite Quantum Dots as Multifunctional Additives for Highly Efficient and Stable Perovskite Solar Cells

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Multifunctional Benzoquinone Additive for Efficient and Stable Planar Perovskite Solar Cells

Cited by 140 publications

References 41 publications

Novel Surface Passivation for Stable FA0.85MA0.15PbI3 Perovskite Solar Cells with 21.6% Efficiency

Novel Surface Passivation for Stable FA0.85MA0.15PbI3 Perovskite Solar Cells with 21.6% Efficiency

The Relation of Phase‐Transition Effects and Thermal Stability of Planar Perovskite Solar Cells

Goethite Quantum Dots as Multifunctional Additives for Highly Efficient and Stable Perovskite Solar Cells

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Novel Surface Passivation for Stable FA_0.85MA_0.15PbI₃ Perovskite Solar Cells with 21.6% Efficiency

Novel Surface Passivation for Stable FA_0.85MA_0.15PbI₃ Perovskite Solar Cells with 21.6% Efficiency