TY - JOUR
T1 - Graded bulk-heterojunction enables 17% binary organic solar cells via nonhalogenated open air coating
AU - Zhang, Ying
AU - Liu, Kuan
AU - Huang, Jiaming
AU - Xia, Xinxin
AU - Cao, Jiupeng
AU - Zhao, Guangming
AU - Fong, Patrick W.K.
AU - Zhu, Ye
AU - Yan, Feng
AU - Yang, Yang
AU - Lu, Xinhui
AU - Li, Gang
N1 - Funding Information:
G.L. and K.L. thanks the Research Grants Council of Hong Kong (GRF grant 15218517, CRF C5037-18G, PDFS2021-5S04), National Science Foundation of China (NSFC 51961165102), the funding support from Shenzhen Science and Technology Innovation Commission (Project No. JCYJ 20200109105003940), the Sir Sze-yuen Chung Endowed Professorship Fund (8-8480) provided by the Hong Kong Polytechnic University, and K. L. thanks Guangdong Basic Research Foundation (2020A1515110156). X.L. thanks the Research Grants Council of Hong Kong (GRF grant 14314216).
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - Graded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated G-BHJ OSCs deliver an outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence X-ray diffraction (GI-XRD) techniques enable the visualization of polymer/NFA composition and crystallinity gradient distributions, which benefit charge transport, and enable outstanding thick OSC PCEs (16.25% for 300 nm, 14.37% for 500 nm), which are among the highest reported. Moreover, the nonhalogenated solvent enabled G-BHJ OSC via open-air blade coating and achieved a record 16.77% PCE. The blade-coated G-BHJ has drastically different D-A crystallization kinetics, which suppresses the excessive aggregation induced unfavorable phase separation in BHJ. All these make G-BHJ a feasible and promising strategy towards highly efficient, eco- and manufacture friendly OSCs.
AB - Graded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated G-BHJ OSCs deliver an outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence X-ray diffraction (GI-XRD) techniques enable the visualization of polymer/NFA composition and crystallinity gradient distributions, which benefit charge transport, and enable outstanding thick OSC PCEs (16.25% for 300 nm, 14.37% for 500 nm), which are among the highest reported. Moreover, the nonhalogenated solvent enabled G-BHJ OSC via open-air blade coating and achieved a record 16.77% PCE. The blade-coated G-BHJ has drastically different D-A crystallization kinetics, which suppresses the excessive aggregation induced unfavorable phase separation in BHJ. All these make G-BHJ a feasible and promising strategy towards highly efficient, eco- and manufacture friendly OSCs.
UR - https://www.scopus.com/pages/publications/85112094414
U2 - 10.1038/s41467-021-25148-8
DO - 10.1038/s41467-021-25148-8
M3 - Journal article
AN - SCOPUS:85112094414
SN - 2041-1723
VL - 12
SP - 1
EP - 13
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 4815
ER -