18.9% Efficiency Ternary Organic Solar Cells Enabled by Isomerization Engineering of Chlorine‐Substitution on Small Molecule Donors

Zhang, Chenyang; Li, Jing; Deng, Wanling; Dai, Junpeng; Yu, Jifa; Lu, Guanghao; Hu, Hanlin; Wang, Kai

doi:10.1002/adfm.202301108

Cited by 24 publications

(12 citation statements)

References 70 publications

(75 reference statements)

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“…If these PCN electrodes can be combined with OSCs with SHJ structured or other novel active layers, the comprehensive performance of semi‐transparent OSCs will be further improved. Moreover, with the continuous development of OSCs, more high‐efficiency OSCs are designed and fabricated, [ 46–49 ] the combination of these high‐performance devices with our PCNs can further enhance the performance of semi‐transparent colorful OSCs for BIPV applications.…”

Section: Resultsmentioning

confidence: 99%

Planar Coupled Nanocavities for Efficient Solar Spectrum Engineering

Jin

Fan

et al. 2023

Advanced Optical Materials

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Tailoring the solar spectrum is critical for energy devices including solar cells and colorful radiative coolers, requiring additional photonic structures with manipulation capabilities adaptable to different application circumstances. However, existing photonic structures cannot effectively balance the trade‐offs between these energy devices' primary functionality, coloration, and visible transparency. Here, a series of planar coupled nanocavities (PCNs) are designed and fabricated, which can manipulate the solar spectrum of energy devices more versatilely than conventional planar multilayers. By judiciously designing and tailoring the coupling effect in the PCNs, the transmissive colors of the PCNs can occupy 99.9% of the sRGB area provided the benchmark for window applications is achieved (average visible transmittance, AVT > 25%), while 25.4% of the sRGB area can be covered by the reflective colors of sub‐ambient radiative coolers with PCNs. Moreover, when serving as the semitransparent electrodes of colorful organic solar cells (OSCs), the PCNs can provide a significantly larger color gamut than commonly used multilayered electrodes under different performance benchmarks. Remarkably, the PCNs can even locally break the trade‐offs between the power conversion efficiency (PCE) and AVT and electrode conductivity of the OSCs. The proposed PCNs provide a promising route for delicately tailoring the solar spectrum with simple multilayered structures.

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Section: Resultsmentioning

confidence: 99%

Planar Coupled Nanocavities for Efficient Solar Spectrum Engineering

Jin

Fan

et al. 2023

Advanced Optical Materials

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“…In order to elucidate the impact of different SVA solvents on charge transport processes, the mobilities of both hole and electron carriers were estimated using the space‐charge‐limited current (SCLC) model. [ 38–40 ] The hole mobility µ h and electron mobility µ e are displayed in Figure 5f and Table S6 (Supporting Information). The µ h and µ e of FB, CB, BB, and IB‐treated devices were 3.73/4.14, 4.51/4.72, 3.34/4.97, and 3.46/5.49 × 10 −4 cm 2 V −1 S −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Efficiency Boost in All‐Small‐Molecule Organic Solar Cells: Insights from the Re‐Ordering Kinetics

Sun,

Lv,

Wang

et al. 2023

Advanced Energy Materials

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Achieving high‐performance in all‐small‐molecule organic solar cells (ASM‐OSCs) significantly relies on precise nanoscale phase separation through domain size manipulation in the active layer. Nonetheless, for ASM‐OSC systems, forging a clear connection between the tuning of domain size and the intricacies of phase separation proves to be a formidable challenge. This study investigates the intricate interplay between domain size adjustment and the creation of optimal phase separation morphology, crucial for ASM‐OSCs’ performance. It is demonstrated that exceptional phase separation in ASM‐OSCs’ active layer is achieved by meticulously controlling the continuity and uniformity of domains via re‐packing process. A series of halogen‐substituted solvents (Fluorobenzene, Chlorobenzene, Bromobenzene, and Iodobenzene) is adopted to tune the re‐packing kinetics, the ASM‐OSCs treated with CB exhibited an impressive 16.2% power conversion efficiency (PCE). The PCE enhancement can be attributed to the gradual crystallization process, promoting a smoothly interconnected and uniformly distributed domain size. This, in turn, leads to a favorable phase separation morphology, enhanced charge transfer, extended carrier lifetime, and consequently, reduced recombination of free charges. The findings emphasize the pivotal role of re‐packing kinetics in achieving optimal phase separation in ASM‐OSCs, offering valuable insights for designing high‐performance ASM‐OSCs fabrication strategies.

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“…45–47 Recently, Wang et al developed a chlorinated benzodithiophene (BDT) based SM donor named αBTCl, which was introduced into the PM6:L8-BO binary system to fabricate double-donor ternary OSCs. 48 The incorporation of αBTCl endows the ternary device with extended absorption, enhanced crystallinity, cascaded energy levels, and reduced charge recombination, yielding an outstanding PCE of 18.96%, which demonstrates that ternary OSCs based on SM donor guest components are also an effective way to achieve superior efficiencies.…”

Section: Introductionmentioning

confidence: 96%