Large‐Area Flexible Organic Solar Cells

Huang, Shaorong; Wang, Yufei; Hou, Lintao; Chen, Lie

doi:10.1002/9783527833658.ch11

“…Organic solar cells (OSCs) have unique properties, such as flexibility, solution-processability, light weight and low cost, that have attracted much attention in recent years. [1][2][3][4][5] These properties enable promising applications in various fields, such as indoor photovoltaics, [6][7][8][9] semitransparent windows [10][11][12] and wearable devices. [3,[13][14][15] OSCs have made significant progress with the innovation of conjugated materials, including donor polymers and electron acceptors.…”

Section: Introductionmentioning

confidence: 99%

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Xie,

Deng,

Zhao

et al. 2024

Angew Chem Int Ed

0

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Ternary organic solar cells (T‐OSCs) represent an efficient strategy for enhancing the performance of OSCs. Presently, the majority of high‐performance T‐OSCs incorporates well‐established Y‐acceptors or donor polymers as the third component. In this study, a novel class of conjugated small molecules has been introduced as the third component, demonstrating exceptional photovoltaic performance in T‐OSCs. This innovative molecule comprises ethylenedioxythiophene (EDOT) bridge and 3‐ethylrhodanine as the end group, with the EDOT unit facilitating the creation of multiple conformation locks. Consequently, the EDOT‐based molecule exhibits two‐dimensional charge transport, distinguishing it from the thiophene‐bridged small molecule, which displays fewer conformation locks and provides one‐dimensional charge transport. Furthermore, the robust electron‐donating nature of EDOT imparts the small molecule with cascade energy levels relative to the electron donor and acceptor. As a result, OSCs incorporating the EDOT‐based small molecule as the third component demonstrate enhanced mobilities, yielding a remarkable efficiency of 19.3%, surpassing the efficiency of 18.7% observed for OSCs incorporating thiophene‐based small molecule as the third component. The investigations in this study underscore the excellence of EDOT as a building block for constructing conjugated materials with multiple conformation locks and high charge carrier mobilities, thereby contributing to elevated photovoltaic performance in OSCs.

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“…Organic solar cells (OSCs) have unique properties, such as flexibility, solution-processability, light weight and low cost, that have attracted much attention in recent years. [1][2][3][4][5] These properties enable promising applications in various fields, such as indoor photovoltaics, [6][7][8][9] semitransparent windows [10][11][12] and wearable devices. [3,[13][14][15] OSCs have made significant progress with the innovation of conjugated materials, including donor polymers and electron acceptors.…”

Section: Introductionmentioning

confidence: 99%

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Xie,

Deng,

Zhao

et al. 2024

Angewandte Chemie

0

View full text Add to dashboard Cite

Ternary organic solar cells (T‐OSCs) represent an efficient strategy for enhancing the performance of OSCs. Presently, the majority of high‐performance T‐OSCs incorporates well‐established Y‐acceptors or donor polymers as the third component. In this study, a novel class of conjugated small molecules has been introduced as the third component, demonstrating exceptional photovoltaic performance in T‐OSCs. This innovative molecule comprises ethylenedioxythiophene (EDOT) bridge and 3‐ethylrhodanine as the end group, with the EDOT unit facilitating the creation of multiple conformation locks. Consequently, the EDOT‐based molecule exhibits two‐dimensional charge transport, distinguishing it from the thiophene‐bridged small molecule, which displays fewer conformation locks and provides one‐dimensional charge transport. Furthermore, the robust electron‐donating nature of EDOT imparts the small molecule with cascade energy levels relative to the electron donor and acceptor. As a result, OSCs incorporating the EDOT‐based small molecule as the third component demonstrate enhanced mobilities, yielding a remarkable efficiency of 19.3%, surpassing the efficiency of 18.7% observed for OSCs incorporating thiophene‐based small molecule as the third component. The investigations in this study underscore the excellence of EDOT as a building block for constructing conjugated materials with multiple conformation locks and high charge carrier mobilities, thereby contributing to elevated photovoltaic performance in OSCs.

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“…Organic semiconductors are promising for enabling printable, mechanically flexible, and lightweight displays, sensors, and energy harvesting technologies. − The electrical properties of organic semiconductors are closely intertwined with structural features, including the molecular backbone and side chain structure, molecular packing motif, molecular orientation, and film grain size. − Multicomponent systems, such as bulk heterojunctions used in organic solar cells, add additional layers of structural complexity, with nanoscale phase separation and finely intermixed domains impacting charge flow. − …”

Section: Introductionmentioning

confidence: 99%

Unambiguous Measurement of Local Hole Current in Organic Semiconductors Using Conductive Atomic Force Microscopy

Fernando

¹

,

Mativetsky

²

2023

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Conductive atomic force microscopy (C-AFM) is a widely used tool for studying the charge transport properties of organic semiconductor films with nanoscale resolution. Local hole current is commonly measured by electrically contacting the film with a high work function C-AFM probe on top and an underlying electrode coated with a hole transport layer. The two voltage polarities, corresponding to the probe injection and substrate injection of holes, are both found in the C-AFM literature; nevertheless, there has been a lack of consideration about the possible influence of voltage polarity on image contrast and charge transport mechanisms. By analyzing local hole current maps and current−voltage curves for three organic semiconductors (a small molecule and two polymers), we find that probe and substrate injection leads to drastically different hole current maps and charge transport mechanisms. Specifically, the substrate injection of holes exhibits ohmic characteristics at low voltages and space-charge-limited current behavior at elevated voltages. Conversely, the probe injection of holes leads to injection-limited current that is sensitive to the state of the probe− sample interface. These measurements provide a blueprint for ensuring that C-AFM measurements are unambiguously probing the bulk properties of organic semiconductor films.

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Large‐Area Flexible Organic Solar Cells

Cited by 7 publications

References 116 publications

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Ethylenedioxythiophene‐Based Small Molecular Donor with Multiple Conformation Locks for Organic Solar Cells with Efficiency of 19.3 %

Unambiguous Measurement of Local Hole Current in Organic Semiconductors Using Conductive Atomic Force Microscopy

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