Ortsaufgelöste Photostrommessungen (OBIC) am Halbleiter / Elektrolyt-Kontakt im Sub-Mikrometerbereich
Ortsaufgelöste Photostrommessungen (OBIC) am Halbleiter / Elektrolyt-Kontakt im Sub-Mikrometerbereich
When a semiconductor is inserted into an electrolyte, a rectifying electrical contact is produced. This contact is suitable for converting solar into electrical or chemical energy. It also acts as a model System for solid state contacts as are used for example in electronic circuits. In this study,...
| Personal Name(s): | Deppe, J. (Corresponding author) |
|---|---|
| Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
| Imprint: |
Jülich
Forschungszentrum Jülich, Zentralbibliothek, Verlag
1999
|
| Physical Description: |
218 p. |
| Document Type: |
Report Book |
| Research Program: |
Addenda |
| Series Title: |
Berichte des Forschungszentrums Jülich
3715 |
| Link: |
OpenAccess OpenAccess |
| Publikationsportal JuSER |
|
When a semiconductor is inserted into an electrolyte, a rectifying electrical contact is produced. This contact is suitable for converting solar into electrical or chemical energy. It also acts as a model System for solid state contacts as are used for example in electronic circuits. In this study, spatial variations of such electrolyte/semiconductor-interfaces were investigated by photocurrent measurements using a newly constructed photoelectrochemical scanning laser microscope (SLM) with a very high spatial resolution in the sub-micrometer range. These measurements provide information about the lateral photocurrent density profile and the lateral quantum efficiency profile of a sample. Physical properties such as lateral changes in the electrical potential in the contact area could be deduced from that. This study focuses an the question: which photoelectrochemical and electronic processes primarily determine the spatial resolution observed. The relevant processes are above all a light-induced flatband potential shift and lateral minority carrier diffusion and drift. These investigations were mainly performed with polycrystalline as well as with partially corroded, defect-rich or gold-structured, single crystalline titanium dioxide (TiO$_{2}$). |