TY - JOUR
T1 - An insight on oxide interlayer in organic solar cells
T2 - From light absorption and charge collection perspectives
AU - Wu, Zhenghui
AU - Wu, Bo
AU - TAM, Hoi Lam
AU - ZHU, Fu Rong
N1 - Funding Information:
This work was supported by Research Grants Council of Hong Kong Special Administrative Region, China , Project No. T23-713/11 , GRF12303114 , National Natural Science Foundation of China (No. 61275037 ), Shenzhen Peacock Project , KQTD20140630110339343 and Hong Kong Baptist University FRG2/14-15/081 .
PY - 2016/4/1
Y1 - 2016/4/1
N2 - A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on 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): [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ∼20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer.
AB - A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on 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): [6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ∼20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer.
KW - Absorption enhancement
KW - Charge collection efficiency
KW - Interfacial exciton dissociation
KW - Oxide/organic hetero-interface
KW - Transient photocurrent
UR - http://www.scopus.com/inward/record.url?scp=84957053046&partnerID=8YFLogxK
U2 - 10.1016/j.orgel.2016.01.040
DO - 10.1016/j.orgel.2016.01.040
M3 - Journal article
AN - SCOPUS:84957053046
SN - 1566-1199
VL - 31
SP - 266
EP - 272
JO - Organic Electronics
JF - Organic Electronics
ER -
