A Novel Conductive Mesoporous Layer with a Dynamic Two‐Step Deposition Strategy Boosts Efficiency of Perovskite Solar Cells to 20%

Sun, Haoxuan; Deng, Kaiming; Zhu, Yayun; Liao, Min; Xiong, Jie; Li, Yanrong; Li, Liang

doi:10.1002/adma.201801935

Cited by 106 publications

(79 citation statements)

References 49 publications

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“…The commonly used electron extraction layers in perovskite photodiodes are TiO 2 , [8,9] SnO 2 , [10,11] C 60 , [12,13] and phenyl-C61 butyric acid methyl ester (PCBM). [31] Finally, the Spiro-OMeTAD layer was coated on the perovskite film and 100 nm thick Ag electrode was deposited by thermal evaporation to obtain the final device. These parameters are comparable and even higher than previously reported self-powered perovskite and other types of photodetectors (Table S1, Supporting Information).…”

Section: Photodetectorsmentioning

confidence: 99%

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

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possess lower dark currents and higher detectivities. In spite of great progresses, it is complicated to fabricate composite electronic transport layers (ETLs) with matched crystal lattices and energy levels, otherwise the newly formed interface in the composite may bring about large amounts of defects which act as trap sites and recombination centers.Spatially graded composition (bandgap) is an effective route to continuously tune energy levels and bandgap in semiconductors, [20,21] in which the interfacial recombination is alleviated or removed and a graded built-in potential through the whole bulk is produced, enabling stronger separation capability of photogenerated electron-hole pairs. This concept provides a new platform for designing high-performance optoelectronic devices. For example, Krol and co-workers fabricated the gradient W-doped BiVO 4 as a photoanode of photoelectrochemical cell. [22] Compared to the homogeneously doped BiVO 4 , the continuous built-in band bending induces the directional transfer of photogenerated holes from core to surface and thus increases the carrier separation efficiency to 60%. Tailoring the gradient bandgap from 0.35 to 1.42 eV, Pan and co-workers synthesized InAs x P 1-x nanosheets for band-selective infrared photodetectors. [23] We reported graded CdS x Se 1-x nanobelt solar cells by utilizing continuous stepped energy levels to drive electrons and holes toward opposite direction. [24] In p-i-n structured devices, [25][26][27][28] graded composition (bandgap) is basically used in the main photosensitive layer, for which the narrow bandgap region increases the absorption wavelength range, the large bandgap results in a high voltage output, and graded bandgap structure promotes the carriers transport. Inspired by previous results, with the introduction of gradient built-in band bending at the charge extraction layer/perovskite interface, the energy band offset is expected to provide the driving force for enhanced carrier separation, suppressed electron reflux, and reduced recombination, boosting the performance of perovskite photodetectors.In this work, we present a high-performance self-powered photodetector by integrating perovskite with gradient O-doped CdS nanorod array. For the first time, the continuous builtin band bending is introduced at the charge extraction layer/ perovskite interface to manipulate the transfer behavior of carriers in perovskite photodetectors. The optoelectronic measurements reveal that both the responsivity and the response speed of devices strongly depend on the structure of energy band bending. The optimum gradient O-doped CdS/perovskite Self-powered photodetectors are highly desired to meet the great demand in applications of sensing, communication, and imaging. Manipulating the carrier separation and recombination is critical to achieve high performance. In this paper, a self-powered photodetector based on the integrated gradient O-doped CdS nanorod array and perovskite is presented. Through optimizing the degree of continuous built-in ba...

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Section: Photodetectorsmentioning

confidence: 99%

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

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“…Figure f shows the Nyquist plots of devices wo/w TPFPB passivation. The equivalent circuit model is shown in Figure S10, Supporting Information, and is composed of a series resistance ( R s ) and a transfer resistance ( R tr ) that correspond to the high‐frequency element in the Nyquist circle and a recombination resistance ( R rec ) that corresponds to the low‐frequency element in the Nyquist circle . The fitted parameters from the equivalent circuit are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

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

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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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“…There are two semicircles located at different frequency ranges in the Nyquist plots. The high‐frequency component represents the charge transport resistance ( R ct ) and the low‐frequency one corresponds to the charge recombination resistance ( R rec ) occurring at the interfaces . The device prepared at 80 °C has an R ct of 208 Ω and an R rec of 4.24 kΩ, while the values for the 150 °C annealed device are 253 Ω and 1.33 kΩ, respectively, suggesting more efficient charge transport and less charge recombination.…”

Section: Resultsmentioning

confidence: 99%

Bifunctional Ytterbium (III) Chloride Driven Low‐Temperature Synthesis of Stable α‐CsPbI₃ for High‐Efficiency Inorganic Perovskite Solar Cells

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Inorganic perovskite CsPbI3 has been studied as a promising alternative light‐absorbing material for photovoltaic application due to its suitable band gap for converting solar light and enhanced stability toward ambient conditions compared to the organic–inorganic halide perovskite. However, the photoactive α‐phase of CsPbI3 can only be stabilized at a high temperature and the phase transition from α‐phase to δ‐phase easily occurs at room temperature. Herein, ytterbium (III) chloride (YbCl3) as a bifunctional additive is introduced into the perovskite precursor to stabilize the black α‐phase, and high‐quality CsPbI3 films are obtained at a temperature as low as 80 °C. Yb3+ partly replaces Pb2+ to enhance the tolerance factor and favors the formation of α‐phase. The Lewis adduct complex of YbCl3·DMSO in the perovskite film can passivate the perovskite film with reduced defects and help enhance the stability of the α‐phase. The YbCl3‐modified planar‐type α‐CsPbI3 perovskite solar cells show a champion power conversion efficiency of 12.4% with an impressive stability at ambient conditions. The additive induced controlled crystallization provides a simple and promising way to improve the photovoltaic performance of inorganic perovskite solar cells.

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A Novel Conductive Mesoporous Layer with a Dynamic Two‐Step Deposition Strategy Boosts Efficiency of Perovskite Solar Cells to 20%

Cited by 106 publications

References 49 publications

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

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

Bifunctional Ytterbium (III) Chloride Driven Low‐Temperature Synthesis of Stable α‐CsPbI₃ for High‐Efficiency Inorganic Perovskite Solar Cells

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A Novel Conductive Mesoporous Layer with a Dynamic Two‐Step Deposition Strategy Boosts Efficiency of Perovskite Solar Cells to 20%

Cited by 106 publications

References 49 publications

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector

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

Bifunctional Ytterbium (III) Chloride Driven Low‐Temperature Synthesis of Stable α‐CsPbI3 for High‐Efficiency Inorganic Perovskite Solar Cells

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Product

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

Bifunctional Ytterbium (III) Chloride Driven Low‐Temperature Synthesis of Stable α‐CsPbI₃ for High‐Efficiency Inorganic Perovskite Solar Cells