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Visualizing morphological principles for efficient photocurrent generation in organic non-fullerene acceptor blends
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-02-21 , DOI: 10.1039/c9ee03535d Wolfgang Köntges 1, 2, 3, 4, 5 , Pavlo Perkhun 6, 7, 8, 9, 10 , Jochen Kammerer 3, 4, 5, 11, 12 , Riva Alkarsifi 6, 7, 8, 9, 10 , Uli Würfel 13, 14, 14, 15, 16 , Olivier Margeat 6, 7, 8, 9, 10 , Christine Videlot-Ackermann 6, 7, 8, 9, 10 , Jean-Jacques Simon 6, 7, 9, 17, 18 , Rasmus R. Schröder 3, 4, 5, 11, 12 , Jörg Ackermann 6, 7, 8, 9, 10 , Martin Pfannmöller 1, 2, 3, 4, 5
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-02-21 , DOI: 10.1039/c9ee03535d Wolfgang Köntges 1, 2, 3, 4, 5 , Pavlo Perkhun 6, 7, 8, 9, 10 , Jochen Kammerer 3, 4, 5, 11, 12 , Riva Alkarsifi 6, 7, 8, 9, 10 , Uli Würfel 13, 14, 14, 15, 16 , Olivier Margeat 6, 7, 8, 9, 10 , Christine Videlot-Ackermann 6, 7, 8, 9, 10 , Jean-Jacques Simon 6, 7, 9, 17, 18 , Rasmus R. Schröder 3, 4, 5, 11, 12 , Jörg Ackermann 6, 7, 8, 9, 10 , Martin Pfannmöller 1, 2, 3, 4, 5
Affiliation
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The efficiency of organic solar cells with donor polymers and non-fullerene acceptors depends on a complex morphology. Similar chemical and electronic structures impede generating in-depth insights in morphological details. We visualise molecular arrangements and the nanomorphology in PBDB-T:ITIC blends by correlating transmission electron micrographs and material distribution maps. Material phases are identified by machine learning on hyperspectral data from electron spectroscopic imaging. We observe a specific polymorph of ITIC after thermal annealing. During annealing, enhanced by the presence of additives, PBDB-T acts as nucleation site for ITIC due to strong π–π-interactions of the electron withdrawing groups of both molecules. This leads to efficient charge transport paths in ITIC phases with direct π–π-contact to PBDB-T at the interface. We conclude that π–π-stacking between donor and acceptor molecules facilitates charge carrier generation within mixed interface regions.
中文翻译：
可视化形态原理以在有机非富勒烯受体混合物中有效产生光电流
具有供体聚合物和非富勒烯受体的有机太阳能电池的效率取决于复杂的形态。相似的化学和电子结构阻碍了对形态学细节的深入了解。我们通过关联透射电子显微照片和材料分布图来可视化PBDB-T：ITIC共混物中的分子排列和纳米形态。通过对来自电子光谱成像的高光谱数据进行机器学习来识别物相。我们观察到热退火后ITIC的特定多晶型物。在退火过程中，由于存在添加剂而增强，PBDB-T由于两个分子的吸电子基团之间很强的π-π相互作用而充当了ITIC的成核位点。这导致在ITIC阶段有效的电荷传输路径，在接口处直接与PBDB-T进行π-π接触。
更新日期：2020-02-21
中文翻译：
可视化形态原理以在有机非富勒烯受体混合物中有效产生光电流
具有供体聚合物和非富勒烯受体的有机太阳能电池的效率取决于复杂的形态。相似的化学和电子结构阻碍了对形态学细节的深入了解。我们通过关联透射电子显微照片和材料分布图来可视化PBDB-T：ITIC共混物中的分子排列和纳米形态。通过对来自电子光谱成像的高光谱数据进行机器学习来识别物相。我们观察到热退火后ITIC的特定多晶型物。在退火过程中，由于存在添加剂而增强，PBDB-T由于两个分子的吸电子基团之间很强的π-π相互作用而充当了ITIC的成核位点。这导致在ITIC阶段有效的电荷传输路径，在接口处直接与PBDB-T进行π-π接触。
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