Effect of Organic and Inorganic Passivation in Quantum-Dot-Sensitized Solar Cells.
The effect of semiconductor passivation on quantum-dot-sensitized solar cells (QDSCs) has been systematically characterized for CdS and CdS/ZnS. We have found that passivation strongly depends on the passivation agent, obtaining an enhancement of the solar cell efficiency for compounds containing amine and thiol groups and, in contrast, a decrease in performance for passivating agents with acid groups. Passivation can induce a change in the position of TiO2 conduction band and also in the recombination rate and nature, reflected in a change in the β parameter. Especially interesting is the finding that β, and consequently the fill factor can be increased with the passivation treatment. Applying this strategy, record cells of 4.65% efficiency for PbS-based QDSCs have been produced.
†Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Apartado Postal 34, Temixco, Mor., México 62580.
Mauricio Solis
MS
de la Fuente
‡Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain.
Rafael S
RS
Sánchez
‡Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain.
Victoria
V
González-Pedro
§Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Research Techno Plaza, RTP/XF-05 50 Nanyang Drive, Singapore 637553.
Pablo P
PP
Boix
§Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, Research Techno Plaza, RTP/XF-05 50 Nanyang Drive, Singapore 637553.
S G
SG
Mhaisalkar
†Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Apartado Postal 34, Temixco, Mor., México 62580.
Marina E
ME
Rincón
‡Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain.
Juan
J
Bisquert
‡Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain.
Iván
I
Mora-Seró
passivation; quantum dots; sensitized solar cells