Please use this identifier to cite or link to this item: https://doi.org/10.1109/TED.2009.2036787
DC FieldValue
dc.titleOrigin of different dependences of open-circuit voltage on the electrodes in layered and bulk heterojunction organic photovoltaic cells
dc.contributor.authorZhang, C.
dc.contributor.authorTong, S.-W.
dc.contributor.authorJiang, C.-Y.
dc.contributor.authorKang, E.-T.
dc.contributor.authorChan, D.S.H.
dc.contributor.authorZhu, C.
dc.date.accessioned2014-10-07T04:34:16Z
dc.date.available2014-10-07T04:34:16Z
dc.date.issued2010-02
dc.identifier.citationZhang, C., Tong, S.-W., Jiang, C.-Y., Kang, E.-T., Chan, D.S.H., Zhu, C. (2010-02). Origin of different dependences of open-circuit voltage on the electrodes in layered and bulk heterojunction organic photovoltaic cells. IEEE Transactions on Electron Devices 57 (2) : 397-405. ScholarBank@NUS Repository. https://doi.org/10.1109/TED.2009.2036787
dc.identifier.issn00189383
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/82852
dc.description.abstractExperimental results show that the VOC of layered heterojunction (HJ) organic photovoltaic (PV) cells behaves with a very weak dependence on the electrodes. However, the VOC of bulk HJ PV cells behaves with a strong dependence on the electrodes. In this paper, an explanation for the different behaviors of VOC on the electrodes is proposed. It is found that the VOC of the two types of PV cells follows the same mechanism and is mainly determined by the light-injected carriers at the donor/acceptor (D/A) interface and the electrodes. However, the distinct device structures make the boundary conditions in layered and bulk HJ PV cells different, which leads to the different dependences of VOC on the electrodes. The layered HJ PV cells have geometrically flat D/A and metal/organic (M/O) interfaces (the interface near the electrode), which makes the effective thickness from the D/A interface to the M/O interface large. Thus, there is a low electric field at the M/O interface and, then, a very small barrier lowering. Under this condition, the light-injected carriers at the D/A interface tend to pin the Fermi level of the electrodes. As a result, VOC shows only a very weak dependence on the work function of the electrodes. However, the formation of the interpenetrating network in bulk HJ PV cells greatly decreases the D and A domain dimensions and induces the ambipolar carrier distribution in the blend layer. This will cause very large barrier lowering at the M/O interface when there is a high barrier. Under this condition, the light-injected carriers at the D/A interface can no longer pin the electrode Fermi level. Thus, a strong dependence of VOC on the electrodes for bulk HJ PV cells is observed. © 2009 IEEE.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1109/TED.2009.2036787
dc.sourceScopus
dc.subjectAmbipolar carrier distribution
dc.subjectElectrode dependence
dc.subjectLight injection
dc.subjectOpen-circuit voltage
dc.subjectOrganic solar cells
dc.typeArticle
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.contributor.departmentELECTRICAL & COMPUTER ENGINEERING
dc.contributor.departmentCHEMISTRY
dc.description.doi10.1109/TED.2009.2036787
dc.description.sourcetitleIEEE Transactions on Electron Devices
dc.description.volume57
dc.description.issue2
dc.description.page397-405
dc.description.codenIETDA
dc.identifier.isiut000273764800007
Appears in Collections:Staff Publications

Show simple item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

18
checked on May 18, 2022

WEB OF SCIENCETM
Citations

16
checked on May 18, 2022

Page view(s)

163
checked on May 12, 2022

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.