Abstract
We study the effects of thiourea concentration on CdS thin films deposited by chemical bath deposition (CBD), submitted to post-thermal treatments of CdCl2, and its effect on the characteristics of CdS/CdTe solar cells. We compare these cells with similar ones fabricated with CdS-films grown by Close Space Vapor Transport (CSVT). The CBD-CdS cells shows higher open circuit voltage (Voc) and fill factor (FF), while the short circuit current remains with little change, as the ratio of S to Cd in the CBD solution goes from 1 to 5. This dependence changes when there is a variation of the CBD-CdS layer thickness. We have obtained cells with more than 12% efficiency when the CdS layers are deposited by the best CBD condition (S/Cd=5) as compared to the best cells with CdS layers prepared by CSVT that had 11% efficiencies. Other measurements such as spectral response were performed and their results were correlated to the I-V characteristics of the solar cells so that the best performances of CBD-CdS solar cells are explained in terms of the chemical composition of this layer.
| Translated title of the contribution | Efectos de la concentración de tiourea en películas delgadas de CdS cultivadas por depósito de baño químico para células solares de CdTe |
|---|---|
| Original language | English |
| Pages (from-to) | 173-176 |
| Number of pages | 4 |
| Journal | Thin Solid Films |
| Volume | 480-481 |
| DOIs | |
| State | Published - 1 Jun 2005 |
Keywords
- CdS/CdTe solar cells
- Cell efficiency
- Thiourea