Thin films solar cells including a substrate, a backside electrode layer, an optical adsorption layer, a first transparent electricity-conductive thin film, a second transparent electricity-conductive thin film and an upper electrode layer

• Main Authors: TSAI, TUN, LIANG, SHIHANG, SUNG, HUAN-HSIN, NI, CUO-YO, BOR, HUI-YUN, CHUNG, TE-JU, SHIEU, FUH-SHENG, WEI, CHAO-NAN
• Format: Patent
• Language: Chinese; English
• Published: 01.07.2017
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SEMICONDUCTOR DEVICES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The present invention provides a thin film solar cell which includes: a substrate, a back electrode layer, an absorber layer, a first transparent electricity-conductive thin film, a second transparent electricity-conductive thin film and a top electrode layer. The composition of the first transparent electricity-conductive thin film includes ZnO, MgO and Al2O3. The composition of the second transparent electricity-conductive thin film includes ZnO, MgO and Al2O3. Accordingly, through a manner of treating the first transparent electricity-conductive thin film and the second transparent electricity-conductive thin film as a buffer layer and an optical window layer, the use of highly toxic material in solar cells is avoided and the lattice mismatch between film layers inside the cell is reduced. In addition, a good p-n junction can be formed between an n-type semiconductor layer and a p-type CIGS absorber layer, so as to reduce recombination rate and improve photoelectric conversion efficiency.