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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2018 ; 9
(1
): 2059
Nephropedia Template TP
gab.com Text
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English Wikipedia
Robust nonfullerene solar cells approaching unity external quantum efficiency
enabled by suppression of geminate recombination
#MMPMID29802311
Baran D
; Gasparini N
; Wadsworth A
; Tan CH
; Wehbe N
; Song X
; Hamid Z
; Zhang W
; Neophytou M
; Kirchartz T
; Brabec CJ
; Durrant JR
; McCulloch I
Nat Commun
2018[May]; 9
(1
): 2059
PMID29802311
show ga
Nonfullerene solar cells have increased their efficiencies up to 13%, yet quantum
efficiencies are still limited to 80%. Here we report efficient nonfullerene
solar cells with quantum efficiencies approaching unity. This is achieved with
overlapping absorption bands of donor and acceptor that increases the photon
absorption strength in the range from about 570 to 700?nm, thus, almost all
incident photons are absorbed in the active layer. The charges generated are
found to dissociate with negligible geminate recombination losses resulting in a
short-circuit current density of 20?mA?cm(-2) along with open-circuit voltages
>1?V, which is remarkable for a 1.6?eV bandgap system. Most importantly, the
unique nano-morphology of the donor:acceptor blend results in a substantially
improved stability under illumination. Understanding the efficient charge
separation in nonfullerene acceptors can pave the way to robust and
recombination-free organic solar cells.