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Herein, efficient OSCs with a well\u2010controlled vertical structure are realized by a rapid film\u2010forming method combining low boiling point solvent and the sequential blade\u2010coating (SBC) technology. The results of grazing incident wide\u2010angle X\u2010ray scattering measurement show that the vertical component distribution is varied by changing the processing solvent. Novel characterization technique such as tilt resonant soft X\u2010ray scattering is used to test the vertical structure of the films, demonstrating the dichloromethane (DCM)\u2010processed film is truly planar heterojunction. The devices with chloroform (CF) processed upper layer show an increased mixed phase region compared to these devices with toluene (TL) or \u2010DCM\u2010, which is beneficial for improving charge generation and achieving a superior PCE of 17.36%. Despite significant morphological varies, the DCM\u2010processed devices perform slightly lower PCE of 16.66%, which is the highest value in truly planar heterojunction devices, demonstrating higher morphological tolerance. This work proposes a solvent\u2010regulating method to optimize the vertical structure of active layers through SBC technology, and provides a practical guidance for the optimization of the active\u2010layer microstructure.<\/jats:p>","DOI":"10.1002\/smll.202407435","type":"journal-article","created":{"date-parts":[[2024,11,8]],"date-time":"2024-11-08T06:22:51Z","timestamp":1731046971000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A Mixed\u2010Pure Planar Heterojunction Structure of Active Layers for Efficient Sequential Blade\u2010Coating Organic Solar Cells"],"prefix":"10.1002","volume":"21","author":[{"given":"Yilin","family":"Wang","sequence":"first","affiliation":[{"name":"State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University  Xi'an 710049 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