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Prof. Annalisa Bruno
Principle Investigator
We are a research group exploring novel and precisely engineered optoelectronic materials based on hybrid snd sustainable soft semiconductors.
Research Highlights
Low-threshold superfluorescence in quasi-2D metal halide perovskite thin films
Yue Tang et al., Advanced Materials (2025)
This study reveals cooperative quantum emission in quasi-2D perovskite thin films with one of the lowest superfluorescence thresholds reported in perovskites. By mapping the transition between spontaneous emission, amplified spontaneous emission, and superfluorescence across temperature and excitation fluence, the work clarifies how phase dynamics govern light emission in these materials. The findings strengthen the case for metal halide perovskites as a versatile platform for quantum photonics and coherent light sources operating at elevated temperatures.
Buffer-layer-free semitransparent perovskite solar cells with soft-sputtered electrodes
Daniela De Luca et al., ACS Energy Letters (2025)
Semitransparent perovskite solar cells are highly attractive for tandem photovoltaics and building-integrated applications, but transparent electrode deposition often damages the underlying layers. Here, a design-of-experiments strategy enabled a soft-sputtering process for indium tin oxide that delivers buffer-layer-free semitransparent devices with less than 0.5% power-conversion-efficiency loss relative to opaque cells. The study provides a scalable and industry-relevant route to high-performance transparent perovskite devices across multiple absorber compositions and fabrication routes.
Stable infrared Yb-doped perovskite quantum cutters engineered by machine learning
Yao Jing et al., Advanced Materials (2024)
This work combines ligand engineering, phosphine-oxide-assisted synthesis, and machine learning to create highly stable Yb-doped perovskite quantum cutters with near-infrared photoluminescence quantum yield above 190%. The optimized nanocrystals retain their high performance under prolonged storage, continuous UV illumination, and thermal stress, addressing one of the major bottlenecks in this class of materials. Beyond the impressive quantum-cutting efficiency, the study showcases how data-driven materials optimization can accelerate the discovery of robust perovskite emitters for photonics and spectral-conversion applications.
Accelerated MAPbI3 co-evaporation for scalable perovskite manufacturing
Herlina Arianita Dewi et al., ACS Energy Letters (2024)
Vacuum deposition is a promising industrial route for perovskite photovoltaics, but long deposition times remain a practical bottleneck. In this work, the MAPbI3 co-evaporation process was accelerated six-fold, reducing the deposition time from 150 minutes to just 25 minutes without compromising film quality or device performance. The results highlight a major productivity gain for vapor-deposited perovskites and reinforce thermal co-evaporation as a serious pathway toward scalable, high-throughput device fabrication.
Co-evaporated p-i-n perovskite solar cells with sputtered NiOx hole transport layer
Enkhtur Erdenebileg et al., Materials Today Chemistry (2023)
This study reports the first co-evaporated p-i-n perovskite solar cells using sputtered NiOx as the hole transport layer, bringing together two scalable and solvent-free processes in a single device architecture. By tuning the sputtering conditions and interface properties, the work achieved efficient MAPbI3 solar cells while also demonstrating compatibility with low-temperature processing. The paper establishes an important platform for robust, industry-compatible perovskite photovoltaics and underlines the potential of evaporated perovskites for large-area manufacturing.
10/21
Recent progress of vapor-deposited perovskite solar cells (PSCs) has proved the feasibility of this deposition method in achieving promising photovoltaic devices. For the first time, it is probed the versatility of the co-evaporation process in creating perovskite layers customizable for different device architectures. A gradient of composition is created within the perovskite films by tuning the background chamber pressure during the growth process. This method leads to co-evaporated MAPbI3 film with graded Fermi levels across the thickness. Here it is proved that this growth process is beneficial for p-i-n PSCs as it guarantee a favorable energy alignment at the charge selective interfaces. Co-evaporated p-i-n PSCs, with different hole transporting layers, consistently achieve power conversion efficiency (PCE) over 20% with a champion value of 20.6%, one of the highest reported to date. The scaled-up p-i-n PSCs, with active areas of 1 and 1.96 cm2, achieved the record PCEs of 19.1% and 17.2%, respectively, while the flexible PSCs reached a PCE of 19.3%. Unencapsulated PSCs demonstrate remarkable long-term stability, retaining ≈90% of their initial PCE when stored in ambient for 1000 h.
04/21
Thermal stability is a critical criterion for assessing the long-term stability of perovskite solar cells (PSCs). We have shown that un-encapsulated co-evaporated MAPbI3 PSCs have remarkable thermal stability even in an n-i-p structure that employs Spiro-OMeTAD. The PSCs maintain over ≈80% of their initial power conversion efficiency (PCE) after 3600 h at 85 °C.
This excellent thermal stability is related to the perovskite growth process leading to a compact and almost strain-stress-free film. Un-encapsulated PSCs with the same architecture, but incorporating solution-processed perovskite, show a complete PCE degradation after 500 h under the same thermal aging condition.
These results highlight that the control of the perovskite growth process can substantially enhance the PSCs thermal stability, besides the chemical composition. The TE_MAPbI3 impressive long-term thermal stability features the potential for field-operating conditions.
04/20
Although small-area perovskite solar cells (PSCs) have reached remarkable power conversion efficiencies (PCEs), their scalability still represents one of the major limits toward their industrialization. For the first time, we prove that PSCs fabricated by thermal co-evaporation show excellent scalability.
Indeed, our strategy based on material and device engineering allowed us to achieve the PCEs as high as 20.28% and 19.0% for 0.1 and 1 cm2 PSCs and the record PCE value of 18.13% for a 21 cm2 mini-module.
J Li, H.Wang, XY Chin, HA Dewi, K Vergeer, T W Goh, J H Lew, K P Loh, C Soci, T C Sum, H Bolink, N Mathews*, S. Mhaisalkar*, A Bruno* Highly Efficient Thermally Co-evaporated Perovskite Solar Cells and Mini-modules, 1. 4 (5), 1035, (2020)
01/20 Semitransparent perovskite solar cells (SCs) and their potential integration with silicon SCs in tandem configurations attract significantly increasing interest in the photovoltaics community. In addition to being highly spectrally complementary, these perovskite and silicon SCs have very different optimal‐performing sizes and consequently ideal measurement schemes for their integration in four‐terminal (4T) tandem configurations need to be investigated in detail. Herein, the effect of different active areas on both perovskite and silicon SCs on their photovoltaic performances is investigated. Furthermore, the commonly used filtering 4T tandem measurement scheme (named as filtered) is systematically compared with the size‐matching scheme (named as masked) demonstrating that when using the same top semitransparent perovskite and bottom silicon SCs in different measurements schemes, the total 4T tandem power conversion efficiency (PCE) can differ by more than 1%. The concepts presented here highlight the importance of optimal measurement schemes to assess 4T tandem PCE and rationalize the effect of compromise between the subcells size matching and the identification of the maximum PCE potential.
HA Dewi, H Wang, J Li, M Thway, R Sridharan, F Lin, AG Aberle N. Mathews, S Mhaisalkar, A Bruno*, Four‐Terminal Perovskite on Silicon Tandem SolarCells Optimal Measurements Schemes, Energy Technology (2020)
12/2019
Tandem solar cells (SCs) based on perovskite and silicon represent an exciting possibility for a breakthrough in photovoltaics, enhancing solar cell power conversion efficiency (PCE) beyond the single junction limit while keeping the production cost low. A critical aspect to push the tandem PCE close to their theoretical limit is the development of high-performing semi-transparent perovskite top-cells which also allow suitable near-infrared transmission. Here, we have developed highly efficient semi-transparent perovskite solar cells (PSCs) based on both mesoporous and planar architectures, employing Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3 and FA0.87Cs0.13PbI2Br perovskites with bandgap of 1.58 eV and 1.72 eV respectively which achieved PCEs well above 17% and 14% by detailed control of the deposition methods, thickness and optical transparency of the interlayers and the semi-transparent electrode. By combining our champion 1.58 eV PSCs (PCE of 17.7%) with an industrial-relevant low cost n-type Si SCs, a 4 terminals (4T) tandem efficiency of 25.5% has been achieved. Moreover for the first time, 4T tandem SCs performances have been measured in the low light intensity regime achieving a PCE of 26.6%, corresponding to a revealing a relative improvement above 9% compared to standard 1 sun illumination condition. These results are very promising for their implementations under field-operating conditions.
1. HA Dewi, H Wang, J Li, M Thway, R Sridharan, R Stangl, F Lin, AG Aberle N. Mathews, A Bruno*, S Mhaisalkar. HighlyEfficient Semi-Transparent Perovskite Solar Cells for Four TerminalPerovskite-Silicon Tandems, ACS applied materials & interfaces (2019)
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