| Popis: |
Knowing the temperature behavior of the photovoltaic parameters in multi-junction (MJ) solar cells (SCs) can give information suitable for comparing different cell structures and for estimating a potential of their operation in various environmental conditions. As a rule, the cell structures are designed specifically for terrestrial (with high sunlight concentration), or space (sometimes with relatively low concentration) applications, differing in certain, but not principal, details. Structural improvements introduced in one of the cell types may highlight the effective ways for improvements applicable for another cell type. In this work, a set of the state-of-the-art concentrator triple-junction SCs were investigated to analyze the influence of temperature in a very wide range of −170 ≤ T ≤ +85°C, together with the sunlight concentration ratio variation, on the cell performance. In particular, the PV conversion efficiencies as high as 50 – 52% (AM1.5d) have been measured in the temperature range of −120 – −150°C for the sunlight concentration ratios of C = 50 – 300 suns. Such investigations may be regarded as a tool for revealing the presence of the “parasitic” built-in energy barriers at cell structure optimization. |
