Quantum-dot-induced optical transition enhancement in InAs quantum-dot-embedded p-i-n GaAs solar cells
2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 99, no 11, 113514- p.Article in journal (Refereed) Published
Photocurrents (PCs) of three p-i-n GaAs solar cells, sample A with InAs quantum dots (QDs) embedded in the depletion region, B with QDs in the n region, and C without QDs, were studied experimentally and theoretically. Above GaAs bandgap, the PC of A is increased, while B is decreased with respect to C, since in A, the QD-induced reflection of hole wave function increases its overlap with electron wave function so that the optical transition rate is enhanced, while carrier mobility in B is reduced due to QD-induced potential variations. Moreover, A and B have increased PCs in the sub-GaAs-bandgap range due to QD optical absorptions.
Place, publisher, year, edition, pages
2011. Vol. 99, no 11, 113514- p.
Well Infrared Photodetector, Photocurrent, Efficiency
IdentifiersURN: urn:nbn:se:kth:diva-42371DOI: 10.1063/1.3638488ISI: 000295034400089ScopusID: 2-s2.0-80053190661OAI: oai:DiVA.org:kth-42371DiVA: diva2:446959
QC 201110102011-10-102011-10-102012-05-07Bibliographically approved