Quantifying the energy loss for a perovskite solar cell passivated with acetamidine halide

Yuan, Ligang; Luo, Huiming; Wang, Jiarong; Xu, Zonghao; Li, Jiong; Jiang, Qingsong; Yan, Keyou

doi:10.1039/d0ta10871e

Cited by 25 publications

(23 citation statements)

References 40 publications

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“…This finding mainly explains the high V OC of Spiro-4TFETAD-based PSCs. [44,45] Finally, we verified the capabilities of Spiro-4TFETAD on protecting perovskite layer and improving the long-term stability of high-performance PSCs. Without encapsulation, the changes in X-ray diffraction (XRD) patterns were tracked under %60% relative humidity (RH) to estimate the stability of (FAPbI 3 ) 0.97 (MAPbBr 3 ) 0.03 perovskite films coated with Spiro-4TFETAD and Spiro-OMeTAD.…”

Section: Microscopy (Sem) and Atomic Force Microscopy (Afm) As Shown In Figurementioning

confidence: 58%

A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

Zhang

Yuan

et al. 2021

Solar RRL

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It is crucial to finely optimize the properties of hole transport materials (HTMs) to improve the performance and stability of perovskite solar cells (PSCs). Herein, a new spiro‐based HTM (Spiro‐4TFETAD) is developed by replacement of partial methoxy groups in Spiro‐OMeTAD with trifluoroethoxy substituents. Spiro‐4TFETAD has lower highest occupied molecular orbital level, higher thermal stability (Tg = 140 °C), hole mobility (2.04 × 10−4 cm2 V−1 s−1), and better hydrophobicity with respect to Spiro‐OMeTAD. The PSCs using Spiro‐4TFETAD achieve a power conversion efficiency of 21.11% and excellent humidity resistance. It maintains an average 83% of their initial power conversion efficiency values even in high relative humidity of 60% without encapsulation and 82% of its initial performance after 100 h continuous illumination at the maximum power point. The superior performance underscores the promising potential of the trifluoroethoxyl molecular design in preparing new HTMs toward highly efficient and stable PSCs.

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Section: Microscopy (Sem) and Atomic Force Microscopy (Afm) As Shown In Figurementioning

confidence: 58%

A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

Zhang

Yuan

et al. 2021

Solar RRL

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“…[1] For instance, perovskite solar cells (PSCs) have recently attracted great HTL (hole transport layer)/perovskite contact has recently seen increasing interest to further improve the device performance such as 3,3′-(2,7-dibromo-9H-fluorene-9,9-diyl) bis(n,n-dimethylpropan-1-amine), [9] phenylethylammonium iodide, [18,19] and n-hexylammonium bromide, [20] which have also been shown to offer some benefits regarding the decrease V oc loss. [9,11,18,21,22] Nevertheless, the V oc is still limited and the EQE EL is relatively low. To retard charge recombination, the ETL (electron transport layer)/perovskite interface is also concerned.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] Their similar n-i-p heterostructure makes it possible to integrate photovoltaic/electroluminescent (PV/EL) functions in the same device, which is called PV/EL perovskite bifunctional diodes (PBDs). [7][8][9][10][11] PBDs are promising to open up applications of perovskites as colorful emitters, buildingintegrated PVs, and et al, thus are of significance for energy conservation and environmental protection. Besides, the PV and EL have a reciprocity relationship.…”

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confidence: 99%

Perovskite Bifunctional Diode with High Photovoltaic and Electroluminescent Performance by Holistic Defect Passivation

Liu

Duan

Liu

et al. 2021

Small

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attention due to their power conversion efficiency (PCE) rapidly exceeding 25.5% in a small area, which is comparable to the best Si solar cells. [2,3] The perovskite lightemitting diode (PeLED) also has above 20% electroluminescent (EL) external quantum efficiency (EQE EL ). [4][5][6] Their similar n-i-p heterostructure makes it possible to integrate photovoltaic/electroluminescent (PV/EL) functions in the same device, which is called PV/EL perovskite bifunctional diodes (PBDs). [7][8][9][10][11] PBDs are promising to open up applications of perovskites as colorful emitters, buildingintegrated PVs, and et al., thus are of significance for energy conservation and environmental protection. Besides, the PV and EL have a reciprocity relationship. [12] The EQE EL of a PV device is a valuable parameter for solar cell performance and can be used to evaluate the non-radiative recombination to the open-circuit voltage (V oc ) deficit based on reciprocity theorem by measuring the luminescence efficiency under forward bias. [13,14] The nonradiative recombination originates from the interfacial imperfection and the defects, which leads to the lower PCE and EQE EL . It is crucial to develop strategies to reduce the nonradiative recombination and minimize the V oc deficit.To realize efficient PSCs and PeLEDs, high-quality perovskite films with excellent crystallinity and low defect density are required to reduce energy loss. Among perovskite materials used in PSC, formamidinium-lead-iodide (FAPbI 3 )-based perovskites with tiny bromide anions, namely, (FAPbI 3 ) 1-x (MAPbBr 3 ) x where x is less than 0.05 (hereafter referred to as FAPbI 3 -based perovskites), possesses a close-to-ideal bandgap and acceptable stability. However, the FAPbI 3 -based PSC has great energy loss with a large V oc deficit. Improving the performance with the low nonradiative recombination of FAPbI 3 -based PSCs is therefore a major current research focus. To decrease bulk and interface defects, several strategies have been used, such as composition engineering, interface engineering, and surface passivation, and the detailed performance metrics shown in Table S1, Supporting Information. Composition engineering has shown a remarkable effective approach, such as using CsX, KX, and etc. for mixed perovskite. [15][16][17] In addition, the use of additives and defect passivation via surface functionalization in Integration of photovoltaic (PV) and electroluminescent (EL) functions and/or units in one device is attractive for new generation optoelectronic devices but it is challenging to achieve highly comprehensive efficiency. Herein, perovskite solar cells (PSCs) are fabricated, assisted by 3-sulfopropyl methacrylate potassium salt (SPM) additive to tackle this issue. SPMs not only induce large grain size during the film formation but also produce a secondary phase of 2D K 2 PbI 4 to passivate the grain boundaries (GBs). In addition, its sulfonic acid group and potassium ion can coordinate to lead ion and fill the interstitial defects, respectively. Thus...

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“…[ 46 ] The extracted α increases from 0.94 to 0.98 after PTPA addition, indicating the reduced interface charge recombination at the contact between perovskite and Spiro‐OMeTAD owing to the energetic modification. The nonradiative recombination loss in the perovskite solar cells is further studied by the EQE EL versus current density characteristics according to the equation: [ 47–49 ]

Δ V_{oc}^{nonrad} = - \frac{K T}{q} \ln ({EQE}_{EL})

, where Δ V ocnonrad is the V oc loss via nonradiative recombination, EQE EL is the external quantum efficiency with injection current equal to the photocurrent of the device under AM 1.5 G light illumination. With the EQE EL results shown in Figure S16 (Supporting Information), the device comprising PFPA has the reduced nonradiative V oc loss from 136 to 107 mV.…”

Section: Resultsmentioning

confidence: 99%

“…[46] The extracted α increases from 0.94 to 0.98 after PTPA addition, indicating the reduced interface charge recombination at the contact between perovskite and Spiro-OMeTAD owing to the energetic modification. The nonradiative recombination loss in the perovskite solar cells is further studied by the EQE EL versus current density characteristics according to the equation: [47][48][49] ln(EQE )…”

Section: Oc [V]mentioning

confidence: 99%

Additive‐Induced Synergies of Defect Passivation and Energetic Modification toward Highly Efficient Perovskite Solar Cells

Xiong

Hou

Wei

et al. 2021

Advanced Energy Materials

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Defect passivation via additive and energetic modification via interface engineering are two effective strategies for achieving high‐performance perovskite solar cells (PSCs). Here, the synergies of pentafluorophenyl acrylate when used as additive, in which it not only passivates surface defect states but also simultaneously modifies the energetics at the perovskite/Spiro‐OMeTAD interface to promote charge transport, are shown. The additive‐induced synergy effect significantly suppresses both defect‐assisted recombination and interface carrier recombination, resulting in a device efficiency of 22.42% and an open‐circuit voltage of 1.193 V with excellent device stability. The two photovoltaic parameters are among the highest values for polycrystalline CsFormamidinium/Methylammonium (FAMA)/FAMA based n‐i‐p structural PSCs using low‐cost silver electrodes reported to date. The findings provide a promising approach by choosing the dual functional additive to enhance efficiency and stability of PSCs.

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Quantifying the energy loss for a perovskite solar cell passivated with acetamidine halide

Abstract: We quantified non-radiative recombination loss and charge transfer loss for acetamidine halide passivated perovskite solar cells.

Cited by 25 publications

References 40 publications

A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

A Trifluoroethoxyl Functionalized Spiro‐Based Hole‐Transporting Material for Highly Efficient and Stable Perovskite Solar Cells

Perovskite Bifunctional Diode with High Photovoltaic and Electroluminescent Performance by Holistic Defect Passivation

Additive‐Induced Synergies of Defect Passivation and Energetic Modification toward Highly Efficient Perovskite Solar Cells

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