TY - JOUR
T1 - Effect of ZnO Electron Extraction Layer on Charge Recombination and Collection Properties in Organic Solar Cells
AU - Lan, Weixia
AU - Liu, Yang
AU - Wu, Bo
AU - Xu, Bin
AU - Pu, Huayan
AU - Wei, Bin
AU - Peng, Yan
AU - Tian, Wenjing
AU - Zhu, Fu Rong
N1 - Funding Information:
The work was supported by the Research Grants Council, University Grants Committee of Hong Kong Special Administrative Region, China, General Research Fund (GRF/12302419), Collaborative Research Fund (C5037-18GF), Hong Kong Baptist University Interinstitutional Collaborative Research Scheme (RC-ICRS/15-16/04), National Science Foundation of China (61827812 and 91648119), 973 Program (2014CB643506), and Program for Changbaishan Scholars of Jilin Province, China.
PY - 2019/10/28
Y1 - 2019/10/28
N2 - The effect of zinc oxide (ZnO) electron extraction layer (EEL) on charge recombination and collection properties in bulk-heterojunction (BHJ) organic solar cells (OSCs), based on a poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b′] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7):3′H-cyclopropa[8,25] [5,6]fullerene-C70-D5h(6)-3′-butanoicacid, 3′-phenyl-, methyl ester (PC70BM) blend system, has been analyzed using the transient photocurrent (TPC) and photoinduced charge extraction by linearly increasing voltage (photo-CELIV) measurements. The TPC and photo-CELIV results indicate that the trap-limited bimolecular recombination can be strongly suppressed by interposing a 20 nm thick ZnO EEL between the BHJ and cathode, leading to a 9.4% increase in power conversion efficiency. The presence of ZnO EEL is beneficial in efficient operation of OSCs in two ways: (1) suppressing trap-limited bimolecular recombination and (2) enhancing the charge collection at the organic/cathode interface.
AB - The effect of zinc oxide (ZnO) electron extraction layer (EEL) on charge recombination and collection properties in bulk-heterojunction (BHJ) organic solar cells (OSCs), based on a poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b′] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7):3′H-cyclopropa[8,25] [5,6]fullerene-C70-D5h(6)-3′-butanoicacid, 3′-phenyl-, methyl ester (PC70BM) blend system, has been analyzed using the transient photocurrent (TPC) and photoinduced charge extraction by linearly increasing voltage (photo-CELIV) measurements. The TPC and photo-CELIV results indicate that the trap-limited bimolecular recombination can be strongly suppressed by interposing a 20 nm thick ZnO EEL between the BHJ and cathode, leading to a 9.4% increase in power conversion efficiency. The presence of ZnO EEL is beneficial in efficient operation of OSCs in two ways: (1) suppressing trap-limited bimolecular recombination and (2) enhancing the charge collection at the organic/cathode interface.
KW - charge collection
KW - charge recombination
KW - electron extraction layer
KW - organic solar cells
KW - photo-CELIV
UR - http://www.scopus.com/inward/record.url?scp=85073144089&partnerID=8YFLogxK
U2 - 10.1021/acsaem.9b01383
DO - 10.1021/acsaem.9b01383
M3 - Journal article
AN - SCOPUS:85073144089
SN - 2574-0962
VL - 2
SP - 7385
EP - 7392
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 10
ER -
