An Equivalent Circuit for Perovskite Solar Cell Bridging Sensitized to Thin Film Architectures

Yoo, So‐Min; Yoon, Seog Joon; Anta, Juan A.; Lee, Hyo Joong; Boix, Pablo P.; Mora‐Seró, Iván

doi:10.1016/j.joule.2019.07.014

Cited by 93 publications

(117 citation statements)

References 62 publications

(140 reference statements)

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“…In this case, R rec can be simply obtained by the sum of R HF and R LF . [ 60 ] As shown in Figure 4C, the diameters of the two arcs for NMAI‐treated sample (fitted with red line) are larger than those of the control sample (fitted with black line). It means that the devices with the NMAI treatment have larger R rec which is related to the reduced surface/interface trap states and other recombination centers.…”

Section: Resultsmentioning

confidence: 96%

“…The charge dynamic behavior in the complete device is further investigated via electrochemical impedance spectroscopy (EIS), transient photovoltage decay (TPV) and space‐charge‐limited current (SCLC) measurements on both types of samples. The EIS data measured at a bias of 0.75 V under 1 sun illumination was fitted to two arcs at high frequencies (HF) and low frequencies (LF), respectively, using an equivalent circuit model proposed by Mora‐Seró [ 60 ] (Figure 4C inset) Given the fact that the transport resistance ( R t ) is much smaller than recombination resistance ( R rec ) in the high‐performance PSCs, R t can be neglected in the equivalent circuit. In this case, R rec can be simply obtained by the sum of R HF and R LF .…”

Section: Resultsmentioning

confidence: 99%

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Efficient Perovskite Solar Cells by Reducing Interface‐Mediated Recombination: a Bulky Amine Approach

Liang

Luo

et al. 2020

Advanced Energy Materials

229

199

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meantime, the ease of the solution process at low temperature renders this technology up-and-coming for large-scale low-cost manufacture. However, these solution-processed perovskite films are usually polycrystalline, which readily form defects at the grain boundaries and on the surface of the films. [1][2][3][4][5][6] Such defects are the center of non-radiative recombination of photo-generated electrons and holes, which causes shorter carrier lifetime and lower open-circuit voltage (V OC ). Hence, in real devices, higher recombination rate occurs close to the interface of the sequentially deposited layers. For typical n-i-p perovskite solar cells (PSCs), the perovskite/hole transport layer (HTL) interface holds the high defect density, such as cation/anion vacancy and dangling bonds, etc., [7,8] resulting in defect-assisted recombination. Additionally, the energy level mis-alignment near the interface due to quasi-fermi level pinning will increase recombination velocity [9] and the recombination loss occurs inevitably across interfaces between holes in HTL and minority carriers (electron) in the perovskite, or HTL themselves. [10,11] These existing recombination loss channels at the surface/ interface of the perovskite will severely limit the V OC and overall efficiency of PSCs.Many studies have demonstrated that passivation is an efficient method to lessen the non-radiative recombination loss at the surface/interface of the perovskite in n-i-p PSCs. For example, excess PbI 2 [4,[12][13][14] was believed to passivate the grain boundaries and interface of electron transport layer with perovskite; conjugated polymers [15] and insulating poly(methyl methacrylate) [16,17] were also used to passivate the interface of perovskite/HTL. Recently, various ammonium halide compounds, [8,18,19] especially bulky organic ammonium halide salts were adopted to passivate the surface of perovskite, such as 1,8-octanediammonium iodide, [3] adamantylammonium hydroiodide, [7] (fluorine-)phenylethylammonium iodide (F-)PEAI, [20][21][22][23] n-hexyl trimethyl ammonium bromide, [24] etc. They could interact with the undercoordinated ions or form low-dimensional perovskite phases to passivate the surface/ interface of bulk perovskite. The stability of devices was also usually improved due to the suppression of ionic migration by the packed organic moiety or the formation of hydrophobic low-dimensional perovskites. [7,23,25] A very recent work by Jiang et al. found exceptionally that the insulating PEAI salt, rather than the 2D layered PEA 2 PbI 4 perovskite, served as a moreThe presence of non-radiative recombination at the perovskite surface/ interface limits the overall efficiency of perovskite solar cells (PSCs). Surface passivation has been demonstrated as an efficient strategy to suppress such recombination in Si cells. Here, 1-naphthylmethylamine iodide (NMAI) is judiciously selected to passivate the surface of the perovskite film. In contrast to the popular phenylethylammonium iodide, NMAI post-treatment primarily leaves NMAI sal...

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Efficient Perovskite Solar Cells by Reducing Interface‐Mediated Recombination: a Bulky Amine Approach

Liang

Luo

et al. 2020

Advanced Energy Materials

229

199

View full text Add to dashboard Cite

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“…The Nyquist plots were obtained in the dark with an applied bias voltage of 1.0 V and the fitted parameters are summarized in Table S4, Supporting Information. As shown in the equivalent circuit, the internal series resistance ( R s ) was related to the sheet resistance of the electrodes and the charge‐transfer resistance ( R ct ), corresponding to the semicircle in the high frequency region 46,47. The R s values of the three PSCs was similarly.…”

Section: Photovoltaic Performance Of Champion Pscs Based On Differentmentioning

confidence: 96%

A Nontoxic Bifunctional (Anti)Solvent as Digestive‐Ripening Agent for High‐Performance Perovskite Solar Cells

et al. 2020

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The preparation of high‐quality perovskite films is important for achieving high‐performance perovskite solar cells (PSCs). The effective balance between solvent and antisolvent is an essential factor for regulating high‐quality perovskite film during the spin‐coating and thermal‐annealing steps. In this work, a greener, nonhalogenated, nontoxic bifunctional (anti)solvent, methyl benzoate (MB), is developed not only as an antisolvent to rapidly generate crystal seeds at the perovskite spin‐coating step, but also as a digestive‐ripening solvent for the perovskite precursors, which can prevent the loss of organic components during the thermal‐annealing stage and effectively suppress the formation of miscellaneous lead halide phases. As a result, this novel bifunctional (anti)solvent is employed in planar n–i–p PSCs for engineering high‐quality perovskite layers and thus achieving a power conversion efficiency up to 22.37% with negligible hysteresis and >1300 h stability. Moreover, due to the high boiling point and low‐volatility characteristic of MB, high‐performance PSCs are achieved reproducibly at different operating temperatures (22–34 °C). Therefore, this developed bifunctional solvent system can provide a promising platform toward globally upscaling and commercializing PSCs in all seasons and regions.

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“…Measurements were carried out under Xenon lamp (intensity 100 mW cm −2 ) illumination over a wide range of applied voltages and frequencies (from 0 up to V oc and from 1 MHz to 0.1 Hz) . The fitting has been performed using the equivalent circuits discussed by Yoo et al and the recombination resistance ( R rec ) has been approached by addition of the resistances of high frequency and low frequency (lf) semicircles obtained in the Nyquist plot, (Figure S5, Supporting Information). From IS analysis, it was observed that the R rec of the average UVO 60 min SnO 2 ‐treated PSC is significantly higher than that of UVO 0 min SnO 2 PSC over nearly the entire range of the studied voltage bias, indicating that the non‐radiative recombination rate is significantly lower (Figure b).…”

Section: Figures Of Merits Jsc Ff Voc and Pce Expressed As Mean mentioning

confidence: 99%

Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

et al. 2019

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Tin oxide (SnO2) is widely used as an electron transporting layer (ETL) in perovskite solar cells (PSCs) because of its good transparency, band alignment to perovskite, and stability. The interface between the ETL and the perovskite in the PSCs affects the charge extraction process and influences the optoelectronic properties. Surface treatment of SnO2, such as the UV–ozone (UVO) treatment, is shown to enhance the efficiency and reduce the light soaking effect of the PSCs. Herein, the success in control and suppressing hysteresis reaching the highest photoconversion efficiency of 19.4% with negligible hysteresis for the growth of the devices on SnO2 treated with UVO for 60 min is reported. The wettability of the treated SnO2 is well matched with the polar solvent of the perovskite solution, leading to complete coverage of the substrate, although the treatment does not affect the morphology and the crystallinity of the perovskite thin films. Impedance spectroscopy measurement analysis clearly indicates the decrease in the recombination rate after the UVO treatment and the reduction in low frequency capacitance causing a reduction in the current–potential curve hysteresis.

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An Equivalent Circuit for Perovskite Solar Cell Bridging Sensitized to Thin Film Architectures

Cited by 93 publications

References 62 publications

Efficient Perovskite Solar Cells by Reducing Interface‐Mediated Recombination: a Bulky Amine Approach

Efficient Perovskite Solar Cells by Reducing Interface‐Mediated Recombination: a Bulky Amine Approach

A Nontoxic Bifunctional (Anti)Solvent as Digestive‐Ripening Agent for High‐Performance Perovskite Solar Cells

Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

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An Equivalent Circuit for Perovskite Solar Cell Bridging Sensitized to Thin Film Architectures

Cited by 93 publications

References 62 publications

Efficient Perovskite Solar Cells by Reducing Interface‐Mediated Recombination: a Bulky Amine Approach

Efficient Perovskite Solar Cells by Reducing Interface‐Mediated Recombination: a Bulky Amine Approach

A Nontoxic Bifunctional (Anti)Solvent as Digestive‐Ripening Agent for High‐Performance Perovskite Solar Cells

Analysis of the UV–Ozone‐Treated SnO2 Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis

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Analysis of the UV–Ozone‐Treated SnO₂ Electron Transporting Layer in Planar Perovskite Solar Cells for High Performance and Reduced Hysteresis