Optimized performance parameters of the best combination for each of the ETLs and HTLs.
| Optimized device | Cell thickness (μm) | V OC (V) | J SC (mA cm−2) | FF (%) | PCE (%) |
|---|---|---|---|---|---|
| ITO/PCBM/Cs2BiAgI6/CBTS/Au | 0.5/0.05/0.8/0.1/Au | 1.081 | 22.39 | 82.56 | 19.99 |
| ITO/TiO2/Cs2BiAgI6/CBTS/Au | 0.5/0.03/0.8/0.1/Au | 1.084 | 23.80 | 83.61 | 21.55 |
| ITO/ZnO/Cs2BiAgI6/CBTS/Au | 0.5/0.05/0.8/0.1/Au | 1.085 | 23.76 | 83.78 | 21.59 |
| ITO/C60/Cs2BiAgI6/CBTS/Au | 0.5/0.05/0.8/0.1/Au | 1.077 | 19.62 | 82.65 | 17.47 |
| ITO/IGZO/Cs2BiAgI6/CBTS/Au | 0.5/0.03/0.8/0.1/Au | 1.092 | 23.66 | 79.04 | 20.42 |
| ITO/SnO2/Cs2BiAgI6/CBTS/Au | 0.5/0.1/0.8/0.1/Au | 1.084 | 23.77 | 83.54 | 21.52 |
| ITO/CeO2/Cs2BiAgI6/CBTS/Au | 0.5/0.1/0.8/0.1/Au | 0.924 | 23.59 | 66.21 | 14.44 |
| ITO/WS2/Cs2BiAgI6/CBTS/Au | 0.5/0.1/0.8/0.1/Au | 1.085 | 23.54 | 83.91 | 21.43 |