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Nankai University’s Yongsheng Chen in EES: 19.6%! Additive-free binary devices achieve nearly 20% efficiency!
Based on this, Yan Zhao of Fudan University, Bin Kan and Yongsheng Chen of Nankai University, among others, employed an o-quinone-mediated cyclization strategy to synthesize fused polycyclic aromatic frameworks and the corresponding electron acceptors CD-1 and CD-2. Both CD-1 and CD-2 exhibit three-dimensional interpenetrating network structures with high packing densities in single crystals. Consequently, the newly designed acceptors demonstrate remarkable electron-transport properties; for instance, organic field-effect transistor devices based on CD-2 achieve a high electron mobility of 1.1 cm²·V⁻¹·s⁻¹. Notably, additive-free binary organic photovoltaic devices incorporating CD-1 deliver a power conversion efficiency (PCE) of 19.6%, with well-balanced open-circuit voltage and short-circuit current density, while the corresponding additive-free binary devices based on CD-2 also attain a PCE of 19.1%. These results not only underscore the potential of this novel molecular design strategy for developing high-performance electron acceptors but also provide valuable insights into achieving high efficiencies in organic optoelectronic devices. The paper was recently published in Energy & Environmental Science under the title “‘Head Surgery’ of Polycyclic o-Quinones with Cyanated Aromatic Rings towards High Electron Mobility Acceptors Enable 19.6% Additive-Free Binary Organic Solar Cells.”
2025
03-21
Shanghai Jiao Tong University’s Liu Feng Team Reports in Joule: High-Efficiency, Stable High-Entropy Organic Photovoltaic Cells
Organic photovoltaics (OPV) currently suffer from the inability to simultaneously achieve high efficiency and long-term stability, posing a major challenge to their commercialization. In response, a team led by Feng Liu, Shengjie Xu, and Ming Zhang at Shanghai Jiao Tong University has introduced a high-entropy (HE) approach that combines physical blending with chemical synthesis to mix multiple components and thereby increase system entropy; the findings have been published in the journal Joule. The team’s results demonstrate that, owing to the identical acceptor backbone, physically blended HE mixtures retain strong π–π interactions. By introducing different halogen substituents or alkyl chains, structural order is reduced, leading to an optimal blend in which the conduction-band density of states is redistributed, resulting in a larger effective bandgap, reduced nonradiative recombination, and an elevated open-circuit voltage. Building on this HE design principle, the researchers then extended it to chemical synthesis to fabricate HE materials, achieving a maximum power-conversion efficiency of 20.6% (20.3% ± 0.2%, certified as 20.0%) in OPV devices. Moreover, both operational and thermal stability under continuous illumination in conventionally encapsulated devices were significantly improved.
03-06
Latest Nature Chemistry by Academicians Jingjing Xue and Deren Yang of Zhejiang University: Molecular Contact with an Orthogonal π Framework Can Induce Amorphization to Enhance the Performance of Perovskite Solar Cells
Perovskite solar cells represent a highly promising class of photovoltaic devices that have achieved outstanding performance in a remarkably short time. Such high efficiencies typically rely on the use of molecule-based selective contacts, which facilitate the formation of highly ordered molecular assemblies. Although this high degree of order generally enhances charge-carrier transport, it can be compromised under external stress through structural deformation and phase transitions, thereby limiting the long-term operational stability of perovskite solar cells. In light of this, on February 6, 2025, Tianqi Deng, Jingjing Xue, Academician Deren Yang from Zhejiang University, and Rui Wang from Westlake University published in Nature Chemistry a study demonstrating that molecular contacts with an orthogonal π-framework can induce amorphization to enhance the performance of perovskite solar cells. The study presents a novel molecular contact featuring an orthogonal π-framework that exhibits superior resilience to external stimuli compared with conventional conjugated cores. This molecular design gives rise to a disordered, amorphous structure that is not only highly stable but also displays exceptional charge selectivity and transport properties. Perovskite solar cells fabricated using this orthogonal π-framework-based molecular contact demonstrate enhanced long-term durability in accelerated aging tests. This orthogonal π-framework functionality opens up new avenues for the application of molecular design in organic electronics.
02-07
南开大学刘永胜最新AM：26.16%！通过原位产生的2D钙钛矿相实现无MA钙钛矿的受控成核和定向结晶
Achieving both strong stability and high efficiency remains one of the primary challenges for the commercialization of perovskite solar cells. In light of this, on June 21, 2024, Yongsheng Liu from Nankai University published in Advanced Materials a study demonstrating controlled nucleation and oriented crystallization of MA-free perovskites through an in-situ-generated 2D perovskite phase. The research has developed a crystal-growth technique assisted by an in-situ-formed 2D perovskite phase to fabricate high-quality 2D/3D perovskite films. The in-situ-generated 2D perovskite serves as a template for regulating nucleation and oriented crystal growth in α-FAPBI3-rich films.
2024
06-22
Yuan Mingjian of Nankai University, AM: Uniaxially Aligned Chiral Perovskites for Flexible All-Stokes Polarimeters
Full-Stokes polarization detection boasts high integration and portability, offering an effective pathway for next-generation multi-information optoelectronic systems. However, current technologies that rely on optical filters result in rigid and bulky configurations, thereby limiting practical applicability. In light of this, on May 11, 2024, Yuan Ming from Nankai University published in the journal AM a research achievement on the use of uniaxially aligned chiral perovskites in flexible full-Stokes polarimeters. This paper, for the first time, reports a flexible device incorporating a uniaxially aligned chiral perovskite thin film,
06-17
Latest JACS from Liu Yongsheng and Chen Yongsheng at Nankai University: Dipole Moment Tuning of Self-Assembled Monolayer Diphosphonic Acid Molecules Boosts Organic Solar Cell Efficiency Beyond 19.7%
PEDOT:PSS has been widely employed as a hole-extraction layer in organic solar cells. However, over time, its acidic nature can corrode the ITO electrode, thereby adversely affecting the device’s operational lifetime. In light of this, on May 8, 2024, Yongsheng Liu and Yongsheng Chen from Nankai University published in JACS a study demonstrating that tuning the dipole moment of self-assembled monolayers of diphosphonic acid molecules can boost the power conversion efficiency of organic solar cells to over 19.7%. The researchers developed a series of self-assembled monolayer (SAM) diphosphonic acid molecules with tunable dipole moments—namely, 3-BPIC(i), 3-BPIC, and 3-BPIC-F—whose dipole moments increase progressively in that order. Compared with the centrosymmetric 3-BPIC(i), the axially symmetric 3-BPIC and 3-BPIC-F exhibit higher adsorption energies (Eads) on ITO, shorter interfacial spacings, more uniform coverage of the ITO surface, and better interfacial compatibility with the active layer. Notably, the introduction of fluorine atoms results in deeper highest occupied molecular orbital (HOMO) levels and larger dipole moments for 3-BPIC-F relative to 3-BPIC, leading to an increased work function (WF) of the ITO/3-BPIC-F interface. These advantages of 3-BPIC-F not only enhance hole extraction within the device but also reduce interfacial impedance and suppress non-radiative recombination at the interface. Consequently, organic solar cells incorporating a 3-BPIC-F–based SAM achieved a record-high power conversion efficiency of 19.71%, surpassing those based on 3-BPIC(i) (13.54%) and 3-BPIC (19.34%). Importantly, compared with organic solar cells using PEDOT:PSS as the hole-extraction layer, the 3-BPIC-F–based devices exhibit markedly improved stability. This work provides valuable guidance for the future design of functional SAM molecules aimed at realizing higher performance in organic solar cells.
05-13
You Jingbi and Zhang Xingwang, Sci. Adv.: High-Efficiency Pure-Red Perovskite Light-Emitting Diodes Achieved via Strong Passivation with Ultra-Small Molecules
In recent years, perovskite light-emitting diodes (PeLEDs) have attracted considerable attention. However, halogen-vacancy defects in perovskites severely impede the development of high-efficiency devices. Conventional approaches typically rely on bulky passivators, but the effectiveness of defect passivation is often limited by weak bonding or significant steric hindrance.
05-06
Latest AFM from Han Hongwei of Huazhong University of Science and Technology and Lu Xinhui of the Chinese University of Hong Kong: High-efficiency Carbon-based HTM-free Printable Mesoscopic Perovskite Solar Cells via Multifunctional Fluorinated Molecules
Benefiting from their simple and cost-effective fabrication process, printable mesoscopic perovskite solar cells demonstrate significant potential for large-scale production. In these devices, the perovskite layer embedded within the TiO2 and ZrO2 mesoporous scaffolds has a thickness of approximately 3 µm.
05-02
Latest JACS from Zhu Zonglong et al. at City University of Hong Kong: 26.08%! High-efficiency and scalable inverted perovskite solar cells achieved through a polymetallic interface
Inverted perovskite solar cells are facile to fabricate, but their interface properties must be optimized and energy losses minimized to prevent efficiency degradation as the active photovoltaic area is increased. In light of this, on May 1, 2024, Xiaocheng Zeng, Zonglong Zhu of City University of Hong Kong, together with Nicholas J. Long of Imperial College London, published in JACS a study on high-efficiency, scalable inverted perovskite solar cells achieved through a polycyclopentadienyl-metal-based interface. The paper reports a series of ferrocene-derived molecules that can tune the perovskite surface, enabling the fabrication of both small- and large-area perovskite solar cells.
05-01
New Nature Materials from Jun He, Yongbo Yuan of Central South University, and Jinsong Huang of UNC: Mobile Iodide Trapping for Highly Light-Stable and Reverse-Bias-Stable Perovskite Solar Cells
On April 29, 2024, Jun He, Yongbo Yuan of Central South University, and Jin-Song Huang of the University of North Carolina published in Nature Materials research on the use of mobile iodide trapping to achieve highly light-stable and reverse-bias-stable perovskite solar cells. For halide perovskites, which are prone to photodegradation and ion migration, iodide-related defects—such as molecular iodine (I₂) and iodine vacancies—are unavoidable. Even at low concentrations, these defects can trigger self-accelerating chemical reactions, posing a severe challenge to the durability of perovskite solar cells. Fortunately, before I₂ can degrade the perovskite under illumination, it typically diffuses over long distances. Consequently, the harmful I₂ can be effectively captured by materials that strongly bind iodide/polyiodide (Ix⁻).
04-30
