Record 1.1 V Open‐Circuit Voltage for Cu<sub>2</sub>ZnGeS<sub>4</sub>‐Based Thin‐Film Solar Cells Using Atomic Layer Deposition Zn<sub>1‐<i>x</i></sub>Sn<sub><i>x</i></sub>O<sub><i>y</i></sub> Buffer Layers
Solar RRL