20.7% highly reproducible inverted planar perovskite solar cells with enhanced fill factor and eliminated hysteresis

Liu, Xixia; Cheng, Yuanhang; Liu, Chao; Zhang, Tianxiang; Zhang, Nengduo; Zhang, Siwen; Chen, Jingshen; Xu, Qing‐Hua; Ouyang, Jianyong; Gong, Hao

doi:10.1039/c9ee00872a

Cited by 204 publications

(183 citation statements)

References 70 publications

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“…The unique semiconducting properties of perovskite allow the fabrication of photovoltaic devices with either conventional n‐i‐p or inverted p‐i‐n configurations . Inverted PSCs have attracted extensive attention due to their simple fabrication process, potential application in flexible devices, and excellent compatibility with tandem photovoltaics . However, the development of inverted PSCs is still lagging behind that of PSCs with conventional configurations, particularly due to their lower open‐circuit voltage ( V OC ) and fill factor (FF) .…”

Section: Photovoltaic Parameters Obtained From the Optimized Devices mentioning

confidence: 99%

High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells

Zhang

et al. 2020

Advanced Energy Materials

223

196

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Inverted perovskite solar cells (PSCs) with low‐temperature processed hole transporting materials (HTMs) suffer from poor performance due to the inferior hole‐extraction capability at the HTM/perovskite interfaces. Here, molecules with controlled electron affinity enable a HTM with conductivity improved by more than ten times and a decreased energy gap between the Fermi level and the valence band from 0.60 to 0.24 eV, leading to the enhancement of hole‐extraction capacity by five times. As a result, the 3,6‐difluoro‐2,5,7,7,8,8‐hexacyanoquinodimethane molecules are used for the first time enhancing open‐circuit voltage (Voc) and fill factor (FF) of the PSCs, which enable rigid‐and flexible‐based inverted perovskite devices achieving highest power conversion efficiencies of 22.13% and 20.01%, respectively. This new method significantly enhances the Voc and FF of the PSCs, which can be widely combined with HTMs based on not only NiOx but also PTAA, PEDOTT:PSS, and CuSCN, providing a new way of realizing efficient inverted PSCs.

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Section: Photovoltaic Parameters Obtained From the Optimized Devices mentioning

confidence: 99%

High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells

Zhang

et al. 2020

Advanced Energy Materials

223

196

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“…Regarding to PEDOT:PSS, the low HOMO energy level causes low V OC ( usually 0.84–0.97 V, barely exceed 1.0 V), and additionally, its acidic and hygroscopic nature adversely lead to degradation of perovskite layer and corrosion of anodes, which reduce the stabilities of devices . Comparing with PEDOT:PSS, PTAA usually yields higher V oc and PCEs, and also alleviates problems caused by moisture, but its grave hydrophobicity usually causes the recombination loss due to the unideal growth of perovskite .…”

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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“…[48] The fitted parameters were shown in Table S1 (Supporting Information). [49,50] Additionally, the longer decay time τ 2 of PBT1-C was possibly caused by the reduced interface recombination and efficient passivation of traps by the carbonyl groups. PBT1-C/Perovskite and P3HT/Perovskite showed shorter τ 1 lifetime than the pure perovskite film, indicating efficient hole extraction by these two HTMs.…”

mentioning

confidence: 99%

A Dopant‐Free Polymeric Hole‐Transporting Material Enabled High Fill Factor Over 81% for Highly Efficient Perovskite Solar Cells

Feng

Deng

et al. 2019

Advanced Energy Materials

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Although perovskite solar cells (PVSCs) have achieved rapid progress in the past few years, most of the high‐performance device results are based on the doped small molecule hole‐transporting material (HTM), spiro‐OMeTAD, which affects their long‐term stability. In addition, some defects from under‐coordinated Pb atoms on the surface of perovskite films can also result in nonradiative recombination to affect device performance. To alleviate these problems, a dopant‐free HTM based on a donor‐acceptor polymer, PBT1‐C, synthesized from the copolymerization between the benzodithiophene and 1,3‐bis(4‐(2‐ethylhexyl)thiophen‐2‐yl)‐5,7‐bis(2‐alkyl)benzo[1,2‐c:4,5‐c′]dithiophene‐4,8‐dione units is introduced. PBT1‐C not only possesses excellent hole mobility, but is also able to passivate the surface traps of the perovskite films. The derived PVSC shows a high power conversion efficiency of 19.06% with a very high fill factor of 81.22%, which is the highest reported for dopant‐free polymeric HTMs. The results from photoluminescence and trap density of states measurements validate that PBT1‐C can effectively passivate both surface and grain boundary traps of the perovskite.

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20.7% highly reproducible inverted planar perovskite solar cells with enhanced fill factor and eliminated hysteresis

Abstract: The approach of a hydrophilic group grafted buffer layer (HGGBL) was investigated for perovskite growth to realize highly efficient inverted planar perovskite solar cells with superior reproducibility, negligible hysteresis and improved stability.

Cited by 204 publications

References 70 publications

High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells

High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells

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

A Dopant‐Free Polymeric Hole‐Transporting Material Enabled High Fill Factor Over 81% for Highly Efficient Perovskite Solar Cells

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