Inverted perovskite solar cells based on lithium-functionalized graphene oxide as an electron-transporting layer

Nouri, Esmaiel; Mohammadi, M.R.; Lianos, Panagiotis

doi:10.1039/c6cc09876b

Cited by 42 publications

(33 citation statements)

References 24 publications

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“…However, a major drawback of planar m-TiO 2 ETLs, which renders them unsuitable for application as PSCs, is that their interfacial charge extraction is insufficiently rapid. [10,11] This suggests that suitably shaping the architecture of ETLs may be an alternative approach to optimize the charge dynamics at the TiO 2 /perovskite hetero-interface to improve the performance of the PSCs. [7,8] To solve this problem, we previously modified planar TiO 2 ETLs with a thin PC 61 BM buffer layer, and found that the elastic nature of the PC 61 BM could facilitate the formation of high-quality perovskite films and improve the TiO 2 /perovskite interfacial properties.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the modest efficiency of these solar cells and the high cost of the PC 61 BM, it is still essential as well as vital to explore a more comprehensive way to boost the charge extraction and performance of these solar cells. Enlarging the TiO 2 /perovskite interfacial area may effectively release the accumulated electrons at the hetero‐interface because this would increase the probability of electron extraction by the ETL . This suggests that suitably shaping the architecture of ETLs may be an alternative approach to optimize the charge dynamics at the TiO 2 /perovskite hetero‐interface to improve the performance of the PSCs.…”

Section: Introductionmentioning

confidence: 99%

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Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H₂O‐Assisted Hierarchical Electron Transporting Layers

et al. 2018

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The breakthrough of organometal halide perovskite solar cells (PSCs) based on mesostructured composites is regarded as a viable member of next generation photovoltaics. In high efficiency PSCs, it is crucial to finely optimize the charge dynamics and optical properties matching between the perovskites and electron transporting materials to relax the trade‐off between the optical and electrical requirements. Here, a simple antipolar route with H 2 O as the additive is proposed to prepare hierarchical electron transporting layers to boost the efficiency of dopant‐free PSCs. The photovoltaic performance of the PSCs is enhanced owing to increased light‐scattering, improved Ostwald ripening, and photo‐generated electron extraction. Optimization of the H 2 O addition enables a valid power conversion efficiency of 19.9% (reverse scan: 20.02%) to be achieved. The device can retain more than 90% of its initial performance after storage in air more than 30 days. These results are inspiring in that they present that a mesoporous transporting layer could be easily re‐constructed to hierarchical architecture by the antipolar method to further improve the performance of PSCs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H₂O‐Assisted Hierarchical Electron Transporting Layers

et al. 2018

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“…In addition to the merits of broad and strong light absorption, long charge carrier diffusion length, bipolar transport properties, and longer carrier lifetime of the organometal halide perovskites, hole‐ and electron‐transporting layers also play essential role in improving the device performance of PSCs. According to the layer stacking sequence, planar heterojunction PSCs are divided into p–i–n (inverted) and n–i–p (normal) structures . Whatever the structure may be inverted PSCs or a normal PSCs, hole‐transporting materials (HTMs) undertake the responsibility of extracting and collecting the photon‐generated holes from the perovskite active layer .…”

Section: Introductionmentioning

confidence: 99%

Doped Copper Phthalocyanine via an Aqueous Solution Process for Normal and Inverted Perovskite Solar Cells

Wang

et al. 2017

Advanced Energy Materials

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Great efforts toward developing novel and efficient hole‐transporting materials are needed to further improve the device efficiency and enhance the cell stability of perovskite solar cells (PSCs). The poor film conductivity and the low carrier mobility of organic small‐molecule‐based hole‐transporting materials restrict their application in PSCs. This study develops an efficient and stable hole‐transporting material, tetrafluorotetracyanoquinodimethane (F4‐TCNQ)‐doped copper phthalocyanine‐3,4′,4′′,4′′′‐tetra‐sulfonated acid tetra sodium salt (TS‐CuPc) via a solution process, in planar structure PSCs. The p‐type‐doped TS‐CuPc film demonstrates improved film conductivity and hole mobility owing to the strong electron affinity of F4‐TCNQ. By the F4‐TCNQ tailoring, the composite film gives the highest occupied molecular orbital level as high as 5.3 eV, which is beneficial for hole extraction. In addition, the aqueous solution processed TS‐CuPc:F4‐TCNQ precursor is almost neutral with good stability for avoiding the electrode erosion. As a result, the fabricated PSCs employing TS‐CuPc:F4‐TCNQ as the hole‐transporting material exhibit a power conversion efficiency of 16.14% in a p–i–n structure and 20.16% in an n–i–p structure, respectively. The developed organic small molecule of TS‐CuPc provides the diversification of hole‐transporting materials in planar PSCs.

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“…Our concept was to replace the unstable organic components by constructing inverted PSCs with graphene derivatives (i.e., graphene oxide and lithium-functionalized graphene oxide as hole- and electron-transporting layers, respectively). 20,21 However, there are still other choices to make. Thus, in the present work, we have succeeded in constructing functional cells by completely eliminating organic hole transporters and by substituting them with a NiO x −GO blend.…”

Section: Introductionmentioning

confidence: 99%

Construction of Perovskite Solar Cells Using Inorganic Hole-Extracting Components

2018

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A NiO x –graphene oxide (NiO x –GO) hybrid has been prepared by a simple solution-processed method and was used as hole-extraction material in perovskite solar cells with either gold or carbon as back contact electrode. The impact of GO content on the optoelectronic behavior of NiO x and the photovoltaic performance of the fabricated devices has been studied. Thus, GO incorporation showed a significant improvement in the performance of NiO x -based devices. The best attained efficiency was 13.3%, and it was 45% higher than that with pure NiO x . This is attributed to a significant improvement in the hole extraction, recombination resistance, and energy-level matching in comparison to pure NiO x . In addition, NiO x –GO/Au-based perovskite solar cell devices showed a negligible hysteresis effect and high reliability and repeatability. When carbon was used as back contact electrode, the obtained efficiencies were lower, but it leaves space for improvement. Devices based on inorganic hole transporters NiO x or NiO x –GO demonstrated higher stability in ambient air compared to a standard cell based on spiro-OMeTAD.

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Inverted perovskite solar cells based on lithium-functionalized graphene oxide as an electron-transporting layer

Cited by 42 publications

References 24 publications

Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H₂O‐Assisted Hierarchical Electron Transporting Layers

Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H₂O‐Assisted Hierarchical Electron Transporting Layers

Doped Copper Phthalocyanine via an Aqueous Solution Process for Normal and Inverted Perovskite Solar Cells

Construction of Perovskite Solar Cells Using Inorganic Hole-Extracting Components

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Inverted perovskite solar cells based on lithium-functionalized graphene oxide as an electron-transporting layer

Cited by 42 publications

References 24 publications

Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H2O‐Assisted Hierarchical Electron Transporting Layers

Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H2O‐Assisted Hierarchical Electron Transporting Layers

Doped Copper Phthalocyanine via an Aqueous Solution Process for Normal and Inverted Perovskite Solar Cells

Construction of Perovskite Solar Cells Using Inorganic Hole-Extracting Components

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Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H₂O‐Assisted Hierarchical Electron Transporting Layers

Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H₂O‐Assisted Hierarchical Electron Transporting Layers