Colloidal quantum dot solar cells exploiting hierarchical structuring

Handle URI:
http://hdl.handle.net/10754/564053
Title:
Colloidal quantum dot solar cells exploiting hierarchical structuring
Authors:
Labelle, André J.; Thon, Susanna; Masala, Silvia; Adachi, Michael M.; Dong, Haopeng; Farahani, Maryam; Ip, Alexander H.; Fratalocchi, Andrea ( 0000-0001-6769-4439 ) ; Sargent, E. H.
Abstract:
Extremely thin-absorber solar cells offer low materials utilization and simplified manufacture but require improved means to enhance photon absorption in the active layer. Here, we report enhanced-absorption colloidal quantum dot (CQD) solar cells that feature transfer-stamped solution-processed pyramid-shaped electrodes employed in a hierarchically structured device. The pyramids increase, by up to a factor of 2, the external quantum efficiency of the device at absorption-limited wavelengths near the absorber band edge. We show that absorption enhancement can be optimized with increased pyramid angle with an appreciable net improvement in power conversion efficiency, that is, with the gain in current associated with improved absorption and extraction overcoming the smaller fractional decrease in open-circuit voltage associated with increased junction area. We show that the hierarchical combination of micron-scale structured electrodes with nanoscale films provides for an optimized enhancement at absorption-limited wavelengths. We fabricate 54.7° pyramid-patterned electrodes, conformally apply the quantum dot films, and report pyramid CQD solar cells that exhibit a 24% improvement in overall short-circuit current density with champion devices providing a power conversion efficiency of 9.2%.
KAUST Department:
Solar and Photovoltaic Engineering Research Center (SPERC); Materials Science and Engineering Program; Electrical Engineering Program; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Publisher:
American Chemical Society (ACS)
Journal:
Nano Letters
Issue Date:
11-Feb-2015
DOI:
10.1021/nl504086v
Type:
Article
ISSN:
15306984
Sponsors:
This publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. We thank Angstrom Engineering, Inc. and Innovative Technology, Inc. for useful discussions regarding material deposition methods and control of the glovebox environment, respectively. H.D. would like to acknowledge financial support from China Scholarship Council (CSC). The authors thank Larissa Levina for the assistance of CQDs synthesis and E. Palmiano, R. Wolowiec, G. Koleilat, and D. Kopilovic for their technical help over the course of this study. We also thank Professor Heman Miguez of the Institute of Materials Science of Seville for very helpful discussions regarding electrode structuring. We would finally like to thank Professor Peter Herman and Dr. Kitty Kumar, both of the Electrical and Computer Engineering Department at the University of Toronto, for materials and assistance in preparing the Silicon master.
Appears in Collections:
Articles; Electrical Engineering Program; Materials Science and Engineering Program; KAUST Solar Center (KSC); Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorLabelle, André J.en
dc.contributor.authorThon, Susannaen
dc.contributor.authorMasala, Silviaen
dc.contributor.authorAdachi, Michael M.en
dc.contributor.authorDong, Haopengen
dc.contributor.authorFarahani, Maryamen
dc.contributor.authorIp, Alexander H.en
dc.contributor.authorFratalocchi, Andreaen
dc.contributor.authorSargent, E. H.en
dc.date.accessioned2015-08-03T12:29:59Zen
dc.date.available2015-08-03T12:29:59Zen
dc.date.issued2015-02-11en
dc.identifier.issn15306984en
dc.identifier.doi10.1021/nl504086ven
dc.identifier.urihttp://hdl.handle.net/10754/564053en
dc.description.abstractExtremely thin-absorber solar cells offer low materials utilization and simplified manufacture but require improved means to enhance photon absorption in the active layer. Here, we report enhanced-absorption colloidal quantum dot (CQD) solar cells that feature transfer-stamped solution-processed pyramid-shaped electrodes employed in a hierarchically structured device. The pyramids increase, by up to a factor of 2, the external quantum efficiency of the device at absorption-limited wavelengths near the absorber band edge. We show that absorption enhancement can be optimized with increased pyramid angle with an appreciable net improvement in power conversion efficiency, that is, with the gain in current associated with improved absorption and extraction overcoming the smaller fractional decrease in open-circuit voltage associated with increased junction area. We show that the hierarchical combination of micron-scale structured electrodes with nanoscale films provides for an optimized enhancement at absorption-limited wavelengths. We fabricate 54.7° pyramid-patterned electrodes, conformally apply the quantum dot films, and report pyramid CQD solar cells that exhibit a 24% improvement in overall short-circuit current density with champion devices providing a power conversion efficiency of 9.2%.en
dc.description.sponsorshipThis publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. We thank Angstrom Engineering, Inc. and Innovative Technology, Inc. for useful discussions regarding material deposition methods and control of the glovebox environment, respectively. H.D. would like to acknowledge financial support from China Scholarship Council (CSC). The authors thank Larissa Levina for the assistance of CQDs synthesis and E. Palmiano, R. Wolowiec, G. Koleilat, and D. Kopilovic for their technical help over the course of this study. We also thank Professor Heman Miguez of the Institute of Materials Science of Seville for very helpful discussions regarding electrode structuring. We would finally like to thank Professor Peter Herman and Dr. Kitty Kumar, both of the Electrical and Computer Engineering Department at the University of Toronto, for materials and assistance in preparing the Silicon master.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectColloidal quantum dotsen
dc.subjectphotonically enhanced solar cellsen
dc.subjectphotovoltaicsen
dc.subjectstructured substratesen
dc.titleColloidal quantum dot solar cells exploiting hierarchical structuringen
dc.typeArticleen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentElectrical Engineering Programen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.identifier.journalNano Lettersen
dc.contributor.institutionUniv Toronto, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canadaen
dc.contributor.institutionJohns Hopkins Univ, Dept Elect & Comp Engn, Baltimore, MD 21218 USAen
dc.contributor.institutionTsinghua Univ, Dept Chem, Minist Educ, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R Chinaen
kaust.authorMasala, Silviaen
kaust.authorFratalocchi, Andreaen
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