Refine
Has Fulltext
- no (10) (remove)
Document Type
- Article (10)
Language
- English (10)
Is part of the Bibliography
- yes (10) (remove)
Keywords
- perovskite solar cells (2)
- photoluminescence (2)
- 2D perovskites (1)
- CuI (1)
- Energy science and technology (1)
- PEDOT (1)
- Solar cells (1)
- V OC-deficit (1)
- V-OC loss (1)
- all-perovskite tandems (1)
Institute
The performance of perovskite solar cells is predominantly limited by non-radiative recombination, either through trap-assisted recombination in the absorber layer or via minority carrier recombination at the perovskite/transport layer interfaces. Here, we use transient and absolute photoluminescence imaging to visualize all non-radiative recombination pathways in planar pintype perovskite solar cells with undoped organic charge transport layers. We find significant quasi-Fermi-level splitting losses (135 meV) in the perovskite bulk, whereas interfacial recombination results in an additional free energy loss of 80 meV at each individual interface, which limits the open-circuit voltage (V-oc) of the complete cell to similar to 1.12 V. Inserting ultrathin interlayers between the perovskite and transport layers leads to a substantial reduction of these interfacial losses at both the p and n contacts. Using this knowledge and approach, we demonstrate reproducible dopant-free 1 cm(2) perovskite solar cells surpassing 20% efficiency (19.83% certified) with stabilized power output, a high V-oc (1.17 V) and record fill factor (>81%).