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In Situ Structure Characterization in Slot‐Die‐Printed All‐Polymer Solar Cells with Efficiency Over 9%
Author(s) -
Zhong Wenkai,
Hu Qin,
Jiang Yufeng,
Li Yu,
Chen Teresa L.,
Ying Lei,
Liu Feng,
Wang Cheng,
Liu Yi,
Huang Fei,
Cao Yong,
Russell Thomas P.
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900032
Subject(s) - materials science , polymer solar cell , crystallinity , crystallization , polymer , crystallization of polymers , energy conversion efficiency , spin coating , fabrication , characterization (materials science) , evaporation , screen printing , nanotechnology , chemical engineering , optoelectronics , coating , composite material , medicine , alternative medicine , physics , pathology , engineering , thermodynamics
Herein, high‐performance printed all‐polymer solar cells (all‐PSCs) based on a bulk‐heterojunction (BHJ) blend film are demonstrated using PTzBI as the donor and N2200 as the acceptor. A slot‐die process is used to prepare the BHJ blend, which is a cost‐effective, high‐throughput approach to achieve large‐area photovoltaic devices. The real‐time crystallization of polymers in the film drying process is investigated by in situ grazing incidence wide‐angle X‐ray scattering characterization. Printing is found to significantly improve the crystallinity of the polymer blend in comparison with spin coating. Moreover, printing with 1,8‐diiodooctane as the solvent additive enhances the polymer aggregation and crystallization during solvent evaporation, eventually leading to multi‐length‐scale phase separation, with PTzBI‐rich domains in‐between the N2200 crystalline fibers. This unique morphology achieved by printing fabrication results in an impressively high power conversion efficiency of 9.10%, which is the highest efficiency reported for printed all‐PSCs. These findings provide important guidelines for controlling film drying dynamics for processing all‐PSCs.