Rationalizing charge carrier transport in ternary organic solar cells

Hu, Haixiao; Mu, Xinyu; Qin, Wei; Gao, Kun; Hao, Xiaotao; Yin, Hang

doi:10.1063/5.0077882

Cited by 9 publications

(7 citation statements)

References 57 publications

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“…Therefore, the presence of adequate carrier transport pathways may enable the mixture of two differently sized PQDs to effectively mitigate recombination, being beneficial to voltage enhancement. This is analogous to the bulk heterojunction structure employed in organic solar cells, where a combination of two or three organic donor and acceptor materials could promote charge transport, suppress recombination and, consequently, reduce voltage loss, − despite uneven energy level distribution. To further confirm this, we measured time-resolved photoluminescence (TRPL) to determine the carrier lifetime.…”

Section: Resultsmentioning

confidence: 96%

Fostering the Dense Packing of Halide Perovskite Quantum Dots through Binary-Disperse Mixing

Li,

Wang,

et al. 2023

ACS Nano

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Due to their versatile applications, perovskite quantum dot (PQD)-based optoelectrical devices have garnered significant research attention. However, the fundamental packing behavior of PQDs in thin films and its impact on the device performance remain relatively unexplored. Drawing inspiration from theoretical models concerning packing density with size mixtures, this study presents an effective strategy, namely, binary-disperse mixing, aimed at enhancing the packing density of PQD films. Comprehensive grazing-incidence small-angle X-ray characterization suggested that the PQD film consists of three phases: two monosize phases and one binary mixing phase. The volume fraction and population of the binary-size phase can be tuned by mixing an appropriate amount of large and small PQDs. Furthermore, we performed multi-length-scale all-atom and coarse-grained molecular dynamics simulations to elucidate the distribution and conformation of organic surface ligands, highlighting their influence on PQD packing. Notably, the mixing of two PQDs of different sizes promotes closer face-to-face contact. The densely packed binary-disperse film exhibited largely suppressed trap-assisted recombination, much longer carrier lifetime, and thereby improved power conversion efficiency. Hence, this study provides fundamental understanding of the packing mechanism of perovskite quantum dots and highlights the significance of packing density for PQD-based solar cells.

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Section: Resultsmentioning

confidence: 96%

Fostering the Dense Packing of Halide Perovskite Quantum Dots through Binary-Disperse Mixing

Li,

Wang,

et al. 2023

ACS Nano

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“…近年来, 三元共混策略在提高 OSCs 效率方面做出了巨大贡献, 通过引入额外的给/受体材料到活性层中, 在保证低成本、工艺简单的条件下, 能够拓宽光吸收范围、优化共混膜形貌、平衡空穴/电子迁移和减少能量损失以提高器件 PCE [86][87] . [19,[88][89][90] , 主要是通过选择性调控第三组分与主体材料之间的相互作用来实现提高 OSCs 稳定性的目的, 如以自身为网络框架或在主体材料间形成"分子锁"等起到固定 BHJ 形貌的作用 [91] ; 通过第三组分与主体材料之间的相容性差异, 平衡活性层材料的结晶度和混溶性 [92] ; 作为"稳定剂"保护主体材料免于被化学反应破坏 [35] ; 以及凭借自身优异的导热性能避免器件热量积累 [93] 等.…”

Section: 三元策略提高热稳定性unclassified

Research Progress of Thermal Failure Mechanism and Ternary Blending to Improve Thermal Stability of Organic Solar Cells

Zha¹,

Fang²,

Yan³

et al. 2023

Acta Chimica Sinica

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As an emerging high-efficiency solar cell, organic solar cells (OSCs) have been developed rapidly in recent years. The power conversion efficiency (PCE) of OSCs has reached more than 19%, which is the dawn of commercial application. However, the stability of OSCs is not yet satisfied, especially high processing and operation temperature may be applied to the cells, which requires a high thermal stability of the cells. The ternary strategy, where a third component is introduced into the photoactive layer of donor-acceptor based binary OSCs, was found to be able to simultaneously improve device performance and stability by regulating the intermolecular interactions, showing a great potential for application. In this review, we firstly summarized the mechanisms involved in the thermal decay process of OSCs, including thermally induced morphology changes of the photoactive layer, interfacial aging/chemical reactions, and interdiffusion behavior between the layers. Following this, the research progress of the ternary strategies in improving thermal stability are highlighted, and the mechanism for the stabilization effect is reviewed. By the end, the perspective of the ternary strategies in OSCs is given, pointing out that the selection of the proper third component and the understanding on the mechanism of the stabilization effect are the key issues and challenges.

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“…We also prepared hole-only devices based on different PS blending ratios of PBDB-T:N2200 system, and hole mobility (𝜇 h ) of blended and control active layers were obtained by the space charge limited current (SCLC) method. [51][52][53] As shown in Figure 5e, the device with 4% PS also possesses the best hole mobility, which certifies that the interaction of moderate PS and organic all-polymer molecules facilitating the molecular contact and crystallization. [29] Therefore, the improved hole transport is achieved in the active layers by blending PS.…”

Section: Figures S5-s7 (Supporting Informationmentioning

confidence: 99%

Efficient All‐Polymer Photomultiplication‐Type Organic Photodetectors with Prolonged Crystallization Process

Wang,

Cui,

Sha

et al. 2023

Adv Funct Materials

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With the progressive development of photomultiplication‐type organic photodetectors (PM‐OPDs), increasing research efforts are devoted to all‐polymer PM‐OPDs due to their potential in terms of device stability and stretchability. However, poor polymer‐polymer miscibility and entanglement of long polymer chains are still the main challenges to form desirable active layer morphology in such systems. A smooth solidification process is favorable toward realizing a morphology that features ordered molecular orientation and high crystallinity. Herein, morphological control issue in all‐polymer PM‐OPDs is addressed by modifying film formation kinetics with an insulating polymer blending strategy. The prolonged crystallization process of polystyrene‐blended films can form high‐ordered molecular arrangements and crystallinity in donor/acceptor phases, leading to improved charge transport properties and suppressed trap states. With boosting the trap‐assisted photomultiplication effect, the polystyrene‐blended all‐polymer PM‐OPD with a high specific detectivity of 4.0 × 1013 Jones can be achieved due to the accumulation of enhanced photogenerated electrons at the interface and the efficient injection of external holes, which is one of the best detectivity values reported for PM‐OPDs. This study not only reveals valuable insights into the effects of insulating polymers on the film formation kinetics mechanism, but also provides novel strategy to fabricate high‐performance all‐polymer PM‐OPDs.

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Rationalizing charge carrier transport in ternary organic solar cells

Cited by 9 publications

References 57 publications

Fostering the Dense Packing of Halide Perovskite Quantum Dots through Binary-Disperse Mixing

Fostering the Dense Packing of Halide Perovskite Quantum Dots through Binary-Disperse Mixing

Research Progress of Thermal Failure Mechanism and Ternary Blending to Improve Thermal Stability of Organic Solar Cells

Efficient All‐Polymer Photomultiplication‐Type Organic Photodetectors with Prolonged Crystallization Process

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