Monolithic perovskite–organic tandem solar cells (POTSCs) have attracted considerable attention in recent years due to their compatible fabrication routes and advances in single-cell efficiencies. To ...

Self-assembled monolayers (SAMs) have emerged as a transformative class of hole transport materials for inverted perovskite solar cells (PSCs), distinguished by their negligible parasitic absorption, ...

Surface roughness in copper catalysts has emerged as a critical factor for enhancing the C2+ product selectivity in electrochemical CO2 reduction (eCO2RR), but the underlying mechanistic origins remai...

Electrochemical direct air capture (DAC) potentially represents a transformative solution in the fight against climate change. Herein we provide a critical perspective on pH-swing approaches, which l...

Existing solar industry and unique business environment enables fast, cheap scale-up

Tin-halide perovskites currently offer the best photovoltaic performance of lead-free metal-halide semiconductors. However, their transport properties are mostly dominated by holes, owing to ubiquitou...

Promoting bulk charge separation in Ta3N5 through Mg doping was demonstrated as an effective strategy for enhancing photocatalytic water oxidation. However, this strategy exhibits a limited effect in addressing the long-standing issue of poor HER activity of Ta3N5. Herein, the underlying mechanism was first clarified, and a Mg–Hf codoping strategy was developed, which remarkably enhanced the HER activity. Systematic studies revealed that effective interfacial electron transfer between Ta3N5 and Pt was seriously impeded after Mg doping. UPS and DFT calculations demonstrated that Hf codoping significantly accelerates interfacial electron extraction through the modulation of Fermi level. 7.7 and 17.6 times enhancement in HER was achieved over Ta3N5:Mg+Hf as compared with Ta3N5:Mg and Ta3N5, respectively. An outstanding AQY was achieved, ranking among the highest values reported for Ta3N5. This work highlights the importance of effective interfacial electron extraction and presents a feasible approach to rationally designing Ta3N5.

Singlet fission photovoltaics enable the extraction of two electron–hole pairs from each higher-energy photon while leveraging a mature technology such as crystalline silicon (c-Si) as the underlying cell. Significant steps have been made in the development of singlet fission silicon photovoltaics, but all examples reported to date use tetracene as the singlet fission material. Tetracene is photochemically unstable and therefore unsuitable for commercial applications. Here we demonstrate singlet fission-derived triplet exciton transfer to c-Si from photochemically stable dipyrrolonaphthyridinedione (DPND) derivatives, with a thin layer of tin oxide as the passivation layer. An overlayer of poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) was found to improve interface passivation further. These observations demonstrate that singlet fission photovoltaic devices can be made using stable and commercially viable materials.

Understanding processes that contribute to efficiency losses during long-term operation of perovskite solar cells is crucial for achieving operational stability. Although maximum power point tracking...