TY - JOUR
T1 - Over 20% Efficient and Stable Non-Fullerene-Based Ternary Bulk-Heterojunction Organic Solar Cell with WS2 Hole-Transport Layer and Graded Refractive Index Antireflection Coating
AU - Ram, Kiran Sreedhar
AU - Singh, Jai
PY - 2020/6
Y1 - 2020/6
N2 - The power conversion efficiency (PCE) of a ternary organic solar cell (TOSC) with an active layer consisting of PBDB-T-2F and two non-fullerene materials Y6 and SF(BR)4 is simulated. Tungsten disulphide (WS2) is used as the hole transport layer (HTL) to reduce the contact resistance between the active layer and anode which enhances the internal quantum efficiency to 91.7%. It is found that the use of a highly absorbing non-fullerene small molecule acceptor, SF(BR)4, enhances the absorption as well as improves the stability. Finally, the incorporation of the graded refractive index coating, in the form of moth-eye shaped nanostructures, on the top of glass reduces the reflection losses and enhances the transmission coefficient from 0.88 to 0.94. Thus, the TOSC simulated here, of the structure moth-eye-AR/glass/ITO/WS2/PBDB-T-2F:Y6:SF(BR)4/PFN-Br/Al, produces a PCE of 20.87%. The results presented in this paper are expected to provide useful guidance for fabricating highly efficient and stable hybrid bulk-heterojunction solar cells.
AB - The power conversion efficiency (PCE) of a ternary organic solar cell (TOSC) with an active layer consisting of PBDB-T-2F and two non-fullerene materials Y6 and SF(BR)4 is simulated. Tungsten disulphide (WS2) is used as the hole transport layer (HTL) to reduce the contact resistance between the active layer and anode which enhances the internal quantum efficiency to 91.7%. It is found that the use of a highly absorbing non-fullerene small molecule acceptor, SF(BR)4, enhances the absorption as well as improves the stability. Finally, the incorporation of the graded refractive index coating, in the form of moth-eye shaped nanostructures, on the top of glass reduces the reflection losses and enhances the transmission coefficient from 0.88 to 0.94. Thus, the TOSC simulated here, of the structure moth-eye-AR/glass/ITO/WS2/PBDB-T-2F:Y6:SF(BR)4/PFN-Br/Al, produces a PCE of 20.87%. The results presented in this paper are expected to provide useful guidance for fabricating highly efficient and stable hybrid bulk-heterojunction solar cells.
KW - graded index coating
KW - hybrid solar cells
KW - moth-eye antireflection
KW - non-fullerene acceptors
KW - open circuit voltage
KW - small molecule acceptors
KW - ternary blends
UR - http://www.scopus.com/inward/record.url?scp=85084448877&partnerID=8YFLogxK
U2 - 10.1002/adts.202000047
DO - 10.1002/adts.202000047
M3 - Article
AN - SCOPUS:85084448877
SN - 2513-0390
VL - 3
SP - 1
EP - 8
JO - Advanced Theory and Simulations
JF - Advanced Theory and Simulations
IS - 6
M1 - 2000047
ER -