Strong electron acceptor additive based spiro-OMeTAD for high-performance and hysteresis-less planar perovskite solar cells

Wang, Shibo; Sun, Weihai; Zhang, Mingjing; Yan, Huiying; Hua, Guoxin; Zhao, Li; He, Ruowei; Zeng, Weidong; Lan, Zhang

doi:10.1039/d0ra07254k

Cited by 13 publications

(5 citation statements)

References 62 publications

(51 reference statements)

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“…The absorption spectra of all three HTM thin films are displayed in Figures 4 a and S5 . The pristine Spiro-OMeTAD exhibits strong absorption in the UV region, with a peak maximum at 374 nm, which is consistent with data published previously by Wang et al 36 In contrast, the absorbance of pristine EDOT-Amide-TPA and TPABT films were very low in the UV region. 37 We found this new material, TPABT, to be more transparent in the visible region compared to both Spiro-OMeTAD and EDOT-Amide-TPA ( Figure S6 ), which will allow more photons to be absorbed by the perovskite layer and improve the PCE.…”

Section: Resultssupporting

confidence: 91%

Improving the Conductivity of Amide-Based Small Molecules through Enhanced Molecular Packing and Their Application as Hole Transport Mediators in Perovskite Solar Cells

Alkhudhayr,

Sirbu,

Fsadni

et al. 2023

ACS Appl. Energy Mater.

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Organic–inorganic hybrid halide perovskite solar cells (PSCs) have attracted substantial attention from the photovoltaic research community, with the power conversion efficiency (PCE) already exceeding 26%. Current state-of-the-art devices rely on Spiro-OMeTAD as the hole-transporting material (HTM); however, Spiro-OMeTAD is costly due to its complicated synthesis and expensive product purification, while its low conductivity ultimately limits the achievable device efficiency. In this work, we build upon our recently introduced family of low-cost amide-based small molecules and introduce a molecule (termed TPABT) that results in high conductivity values (∼10–5 S cm–1 upon addition of standard ionic additives), outperforming our previous amide-based material (EDOT-Amide-TPA, ∼10–6 S cm–1) while only costing an estimated $5/g. We ascribe the increased optoelectronic properties to favorable molecular packing, as shown by single-crystal X-ray diffraction, which results in close spacing between the triphenylamine blocks. This, in turn, results in a short hole-hopping distance between molecules and therefore good mobility and conductivity. In addition, TPABT exhibits a higher bandgap and is as a result more transparent in the visible range of the solar spectrum, leading to lower parasitic absorption losses than Spiro-OMeTAD, and has increased moisture stability. We applied the molecule in perovskite solar cells and obtained good efficiency values in the ∼15% range. Our approach shows that engineering better molecular packing may be the key to developing high-efficiency, low-cost HTMs for perovskite solar cells.

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Section: Resultssupporting

confidence: 91%

Improving the Conductivity of Amide-Based Small Molecules through Enhanced Molecular Packing and Their Application as Hole Transport Mediators in Perovskite Solar Cells

Alkhudhayr,

Sirbu,

Fsadni

et al. 2023

ACS Appl. Energy Mater.

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“…EIS was further conducted to evaluate the interface resistance (R ct ) of the devices. 56 The semicircle in the high frequency implied the interfacial charge transfer. 57 As shown in Figure 6c, the recombination resistance of the CHEApassivated device is significantly lower than that of the pristine device, which indicated that the CHEA passivation suppressed charge recombination and enhanced effective charge transfer.…”

Section: Resultsmentioning

confidence: 99%

“…EIS was further conducted to evaluate the interface resistance ( R ct ) of the devices . The semicircle in the high frequency implied the interfacial charge transfer .…”

Section: Resultsmentioning

confidence: 99%

Defect Passivation through Cyclohexylethylamine Post-treatment for High-Performance and Stable Perovskite Solar Cells

Liao

Liu

Zuo

et al. 2021

ACS Appl. Energy Mater.

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Perovskite solar cells (PSCs) are one of the most prominent photovoltaic technologies, yet their stability, scalability, and engineering at the molecular level remain challenging. Herein, we report a facile strategy that can simultaneously enhance the stability and efficiency of perovskite optoelectronic devices. In particular, we introduce a passivation molecule, cyclohexylethylamine (CHEA), whose amine group can effectively reduce the number of defect sites and improve the crystallinity of the perovskite by forming Lewis adducts with undercoordinated Pb 2+ ions in the perovskite. Upon passivation by CHEA, the stability and performance of PSCs are correspondingly improved. By optimizing the concentration of CHEA, the power conversion efficiency of the device has been significantly improved from 18.05 to 21.53%.

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“…Notably, Spiro‐OMeTAD is widely used as an organic HTL in PSCs. However, such HTL in pristine form suffers from low hole mobility and conductivity, which requires various dopants, such as t‐BP and hygroscopic LiTFSI salt, to work as an efficient HTL [16] . Concurrently, the inclusion of such dopants increases the overall HTL's cost.…”

Section: Introductionmentioning

confidence: 99%

“…However, such HTL in pristine form suffers from low hole mobility and conductivity, which requires various dopants, such as t-BP and hygroscopic LiTFSI salt, to work as an efficient HTL. [16] Concurrently, the inclusion of such dopants increases the overall HTL's cost. Additionally, the widely used HTL (SpiroOMeTAD) involves a complicated synthesis procedure.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of a Triple‐Cation Perovskite Solar Cell for Efficiency Promotion using Numerical Simulations

Deendyal,

Dhakla,

Singh

et al. 2023

ChemistrySelect

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Formamidinium lead iodide (FAPbI3) perovskite has recently gained immense interests as a possible absorber of hybrid halide perovskite (HHP) based solar cells and are extensively investigated both on experimental and theoretical fronts. However, it is unstable against the moisture, making this material domain inappropriate for long run. The compositional engineering i. e., doping in the absorber layer (FAPbI3) of HHP solar cells appears to be very significant for enhancing the stability and overall photovoltaic performance of perovskite solar cells (PSCs). We deal with the numerical simulation and optimization of (GA/FA/Cs)PbI3 based PSC. A diverse set of ETLs and HTLs have been explored to find the optimal combination from 35 device structures. Among them, La‐doped BaSnO3 (LBSO) and CBTS are found to be most appropriate electron/hole transport layers (ETL/HTL) combination for (GA/FA/Cs)PbI3 absorber layer, respectively. In addition, the impact of various parameters such as thickness, defect density, working temperature and back contact work function on the overall device performance have been investigated. After comprehensive optimizations, the proposed PSC demonstrated the superior photovoltaic performance with power conversion efficiency of 24.36 % and fill factor (FF) of 80.17 %. The present simulation work can serve as a benchmark for the fabrication of proposed PSCs.

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Strong electron acceptor additive based spiro-OMeTAD for high-performance and hysteresis-less planar perovskite solar cells

Abstract: A perovskite solar cell with DDQ doped spiro-OMeTAD HTL delivers a champion power conversion efficiency of 21.16%.

Cited by 13 publications

References 62 publications

Improving the Conductivity of Amide-Based Small Molecules through Enhanced Molecular Packing and Their Application as Hole Transport Mediators in Perovskite Solar Cells

Improving the Conductivity of Amide-Based Small Molecules through Enhanced Molecular Packing and Their Application as Hole Transport Mediators in Perovskite Solar Cells

Defect Passivation through Cyclohexylethylamine Post-treatment for High-Performance and Stable Perovskite Solar Cells

Design and Optimization of a Triple‐Cation Perovskite Solar Cell for Efficiency Promotion using Numerical Simulations

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