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  因此，為了有效地控制活性層形貌并應用于大面積生產，南昌大學/江西師范大學陳義旺教授團隊提出了一種圖案化彎液面輔助溶液印刷（PMA）策略，該策略通過整合順序刮涂技術，能夠有效拉伸聚合物鏈并構建規(guī)則微圖案。該技術通過改善給體/受體（D/A）溶液流動以抑制馬蘭戈尼效應，從而顯著提升大面積薄膜的均勻性。此外，PMA策略通過在印刷過程中增強橫向傳質，構建了理想的垂直互穿形貌，將激子擴散長度從~45 nm提升至~56 nm。基于D18/BO-4Cl:L8-BO三元體系的最佳器件獲得了19.91%（認證效率19.63%）的冠軍光電轉換效率（PCE），以及18.90%/17.05%（1/16.94 cm2）的效率表現(xiàn)，這是目前通過順序印刷工藝制備的偽平面異質結有機太陽能電池（PPHJ OSCs）所報道的最高效率之一。更重要的是，采用PMA策略制備的大面積PPHJ OSCs在面積放大過程中表現(xiàn)出極低的效率損失（5.07%/14.36%）。這些結果表明，該協(xié)同優(yōu)化策略通過調控D/A溶液流動，為制備高質量活性層提供了可靠的技術方案，可顯著提升大面積PPHJOSCs的性能，從而推動其商業(yè)化應用進程。

Figure 1. a) Structural schematics and parameters of normal blade and patterned blade with different micropatterns. b, c) Summary of solution flow direction (from solution state to the final film formation), flow and evaporation rate, and molecular stacking, d, e) simulation of shear force and solution speed, f) AFM images of NBC and G2-PBC PM6 films. g, h) Schematic diagram of PM6 chains arrangement and BO-4Cl molecules stacking of NBC and G2-PBC PM6/BO-4Cl films.

Figure 2. a, b) Time-resolved UV-vis absorption spectra and c, d) peak position evolutions as a function of time, e, f) 2D GIWAXS scattering patterns, g) film-depth-dependent composition profiles, h, i) exciton generation contours, j) dependence of simulated excitons generation rates at each wavelength as a function of film thickness, k, l) depth X-ray photoelectron spectroscopy spectra (F 1s scan) of NBC and G2-PBC PM6/BO-4Cl films.

Figure 3. a, b) TA images, c) 2D TAM images at different delay times, d, e) cross sections through the center of TAM images fitted well with a Gaussian function along the horizontal axis of NBC and G2-PBC PM6/BO-4Cl films. f) Time evolution of the variances of Gaussian profiles, g) PCE and L_D as a function of exciton diffusion coefficient, h) fluorescence lifetime normal distribution charts of different patterned PM6/BO-4Cl films. i, j) Schematic of excitons diffusion and carriers transport paths of NBC and G2-PBC PM6/BO-4Cl systems.

Figure 4. J-V characteristics of a) PM6/BO-4Cl and b) D18/BO-4Cl:L8-BO systems, respectively. c) EQE spectra under simulated AM 1.5 G irradiation (100 mW cm^-2), d) normalized transient photovoltage spectra, e) EQE_EL values, f) summary of energy loss, g) trap density of states spectra, h) MPP tracking in N₂ under 1 sun illumination for sequential blade-coated PPHJ OSCs with different PM6/BO-4Cl films.

Figure 5. a, b) Digital photographs, c, d) OM images, e) thickness distributions and f) UV-vis absorption intensity distributions (PM6 peak) of large-area (5 cm × 5 cm) NBC and G2-PBC PM6/BO-4Cl films. g, h) J-V characteristics (1 cm² and 25 cm² module) of NBC and G2-PBC devices based on D18/BO-4Cl:L8-BO system. i) Statistical diagram of PCE values obtained from the recently reported BHJ and PPHJ devices (via blade-coating) with different active layer area.

  本論文發(fā)表于Advanced Materials（國際材料頂刊《先進材料》，IF=27.4）上，題為“Controlled solution flow via patterned meniscus assist for elongated exciton diffusion length to approaching 20% efficiency in pseudo-planar heterojunction organic solar cells”。本文通訊作者為南昌大學陳義旺/談利承教授、江西師范大學副教授張立福以及湖南師范大學特聘教授翟亞新，第一作者為南昌大學博士研究生毛厚東。

  全文鏈接：https://advanced.onlinelibrary.wiley.com/doi/10.1002/adma.202505266