Open AccessVolatile Solid Additive‐Assisted Sequential Deposition Enables 18.42% Efficiency in Organic Solar Cells
Author(s) -
Qin Jianqiang,
Yang Qianguang,
Oh Jiyeon,
Chen Shanshan,
Odunmbaku George Omololu,
Ouedraogo Nabonswendé Aïda Nadège,
Yang Changduk,
Sun Kuan,
Lu Shirong
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202105347
Subject(s) - crystallinity , organic solar cell , active layer , deposition (geology) , materials science , layer (electronics) , acceptor , phase (matter) , energy conversion efficiency , chemical engineering , analytical chemistry (journal) , polymer , nanotechnology , optoelectronics , chemistry , chromatography , organic chemistry , composite material , physics , condensed matter physics , sediment , engineering , biology , thin film transistor , paleontology
Morphology optimization of active layer plays a critical role in improving the performance of organic solar cells (OSCs). In this work, a volatile solid additive‐assisted sequential deposition (SD) strategy is reported to regulate the molecular order and phase separation in solid state. The OSC adopts polymer donor D18‐Cl and acceptor N3 as active layer, as well as 1,4‐diiodobenzene (DIB) as volatile additive. Compared to the D18‐Cl:N3 (one‐time deposition of mixture) and D18‐Cl/N3 (SD) platforms, the D18‐Cl/N3(DIB) device based on DIB‐assisted SD method exhibits a finer phase separation with greatly enhanced molecular crystallinity. The optimal morphology delivers superior charge transport and extraction, offering a champion power conversion efficiency of 18.42% with significantly enhanced short‐circuit current density ( J sc ) of 27.18 mA cm −2 and fill factor of 78.8%. This is one of the best performances in binary SD OSCs to date. Angle‐dependent grazing‐incidence wide‐angle X‐ray scattering technique effectively reveals the vertical phase separation and molecular crystallinity of the active layer. This work demonstrates the combination of volatile solid additive and sequential deposition is an effective method to develop high‐performance OSCs.