Enhanced performance of perovskite solar cells <i>via</i> anti-solvent nonfullerene Lewis base IT-4F induced trap-passivation

Guo, Yaxiong; Ma, Junjie; Lei, Hongwei; Yao, Fang; Li, Borui; Xiong, Lixia; Fang, Guojia

doi:10.1039/c8ta00583d

Cited by 136 publications

(111 citation statements)

References 37 publications

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“…The trap density in the hole‐only device prepared by the polymer containing anti‐solvent is calculated to be 1.45 × 10 16 cm −3 , which is lower than that of the hole‐only device prepared by the CB anti‐solvent, 1.91 × 10 16 cm −3 , suggesting that polymer passivation can reduce the defects. In the high voltage Child's region, the current density‐voltage curves can be fitted by using SCLC model:

J = \frac{9}{8} ϵ_{0} ϵ_{r} μ \frac{V^{2}}{L^{3}}

where J and V are the measured current density and applied voltage,

{normalϵ}_{0} {normalϵ}_{normalr}

is the permittivity of the component, µ is the charge carrier mobility and L is the thickness of perovskite layer. The hole‐only devices prepared by the polymer containing anti‐solvent have a hole mobility of 9.75 × 10 −3 cm 2 V −1 s −1 , which is higher than that of the hole‐only devices prepared by the CB anti‐solvent, 7.67 × 10 −3 cm 2 V −1 s −1 .…”

Section: Resultsmentioning

confidence: 99%

Defects Passivation With Dithienobenzodithiophene‐based π‐conjugated Polymer for Enhanced Performance of Perovskite Solar Cells

Yang

et al. 2019

Solar RRL

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A dithienobenzodithiophene‐based π‐conjugated polymer consisting of fluorinated benzotriazole and benzothiadiazole is successfully applied through anti‐solvent method to passivate the defects of perovskite crystals. The fluorinated polymer interacts with under coordinated Pb2+ ions in the perovskite crystals to form Pb‐F bond which effectively passivates the defects. The trap density is reduced and the charge carrier transfer between the perovskite film and Spiro‐OMeTAD is also improved after passivation with the polymer. As a result, a power conversion efficiency (PCE) of 18.03% is achieved in the champion cell. After storing in an ambient environment with 60% relative humidity for 1000 h, the device still retains 90% of the original PCE. These results demonstrate that dithienobenzodithiophene‐based π‐conjugated polymers are promising materials for passivation of perovskite films to further improve the performance and stability of perovskite solar cells.

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J = \frac{9}{8} ϵ_{0} ϵ_{r} μ \frac{V^{2}}{L^{3}}

where J and V are the measured current density and applied voltage,

{normalϵ}_{0} {normalϵ}_{normalr}

Section: Resultsmentioning

confidence: 99%

Defects Passivation With Dithienobenzodithiophene‐based π‐conjugated Polymer for Enhanced Performance of Perovskite Solar Cells

Yang

et al. 2019

Solar RRL

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“…It follows that IEICO‐4F should ideally be located at the perovskite grain boundaries to facilitate intergrain charge transfer while preserving intragrain crystallinity. Since perovskite films are commonly grown from a dimethyl sulfoxide (DMSO)‐containing solvent mixture and require an antisolvent treatment to control crystallization, a convenient way to introduce IEICO‐4F into the perovskite layer is to add it to the antisolvent (chlorobenzene, in our case), and deposit the solution during the antisolvent treatment step; a process that is referred to as “loaded dripping strategy” in the literature . With this approach, the additive tends to reside at the perovskite grain boundaries .…”

Section: Summary Of the Photovoltaic Parameters Of Champion Maibr Andmentioning

confidence: 99%

Extending the Photovoltaic Response of Perovskite Solar Cells into the Near‐Infrared with a Narrow‐Bandgap Organic Semiconductor

et al. 2019

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Typical lead‐based perovskites solar cells show an onset of photogeneration around 800 nm, leaving plenty of spectral loss in the near‐infrared (NIR). Extending light absorption beyond 800 nm into the NIR should increase photocurrent generation and further improve photovoltaic efficiency of perovskite solar cells (PSCs). Here, a simple and facile approach is reported to incorporate a NIR‐chromophore that is also a Lewis‐base into perovskite absorbers to broaden their photoresponse and increase their photovoltaic efficiency. Compared with pristine PSCs without such an organic chromophore, these solar cells generate photocurrent in the NIR beyond the band edge of the perovskite active layer alone. Given the Lewis‐basic nature of the organic semiconductor, its addition to the photoactive layer also effectively passivates perovskite defects. These films thus exhibit significantly reduced trap densities, enhanced hole and electron mobilities, and suppressed illumination‐induced ion migration. As a consequence, perovskite solar cells with organic chromophore exhibit an enhanced efficiency of 21.6%, and substantively improved operational stability under continuous one‐sun illumination. The results demonstrate the potential generalizability of directly incorporating a multifunctional organic semiconductor that both extends light absorption and passivates surface traps in perovskite active layers to yield highly efficient and stable NIR‐harvesting PSCs.

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“…During last decade, perovskite solar cells (PSCs) have attracted extensive attentions as one of the next generation photovoltaics, due to their unique merits such as the excellent optical absorption, long‐balanced carrier diffusion length, and easily low‐cost fabrication methods, and to date, the power conversion efficiencies (PCEs) over 24% have been achieved with a regular (n‐i‐p type) mesoporous structures . However, the regular mesoporous structure devices usually have several drawbacks, such as severe hysteresis effects, poor reproducibility, and requirements of processing at high temperature.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Inverted Planar Perovskite Solar Cells Enhanced by Thickness Tuning of New Dopant‐Free Hole Transporting Layer

Lai

Meng

et al. 2019

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A new hole transporting material (HTM) named DMZ is synthesized and employed as a dopant‐free HTM in inverted planar perovskite solar cells (PSCs). Systematic studies demonstrate that the thickness of the hole transporting layer can effectively enhance the morphology and crystallinity of the perovskite layer, leading to low series resistance and less defects in the crystal. As a result, the champion power conversion efficiency (PCE) of 18.61% with JSC = 22.62 mA cm−2, VOC = 1.02 V, and FF = 81.05% (an average one is 17.62%) is achieved with a thickness of ≈13 nm of DMZ (2 mg mL−1) under standard global AM 1.5 illumination, which is ≈1.5 times higher than that of devices based on poly(3,4‐ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT:PSS). More importantly, the devices based on DMZ exhibit a much better stability (90% of maximum PCE retained after more than 556 h in air (relative humidity ≈ 45%–50%) without any encapsulation) than that of devices based on PEDOT:PSS (only 36% of initial PCE retained after 77 h in same conditions). Therefore, the cost‐effective and facile material named DMZ offers an appealing alternative to PEDOT:PSS or polytriarylamine for highly efficient and stable inverted planar PSCs.

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Enhanced performance of perovskite solar cells via anti-solvent nonfullerene Lewis base IT-4F induced trap-passivation

Abstract: We have developed a new method to introduce defect passivation agents using an in situ technique for planar p–i–n perovskite solar cells, during the anti-solvent deposition step.

Cited by 136 publications

References 37 publications

Defects Passivation With Dithienobenzodithiophene‐based π‐conjugated Polymer for Enhanced Performance of Perovskite Solar Cells

Defects Passivation With Dithienobenzodithiophene‐based π‐conjugated Polymer for Enhanced Performance of Perovskite Solar Cells

Extending the Photovoltaic Response of Perovskite Solar Cells into the Near‐Infrared with a Narrow‐Bandgap Organic Semiconductor

High‐Performance Inverted Planar Perovskite Solar Cells Enhanced by Thickness Tuning of New Dopant‐Free Hole Transporting Layer

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