Hot-Carrier Perovskite Solar Cells to Break the Shockley-Queisser Limit


Energy - Solar


This technology relates to a novel device construction of perovskite solar cells (PSCs) to break the maximum Shockley-Queisser (SQ) limit of power conversion efficiency (PCE) (≈33%). In conventional PSCs, the photo-generated hot carriers (electron and hole) always lose their energy via a hot carrier cooling process before they are extracted by the widely used carrier extraction layers where cold carrier extraction are preferred. The technology described herein targets to improve the theoretical power conversion efficiency (PCE) tto reach as high as ≈66% by minimizing the hot carrier cooling loss.




The technology here involves

  1. Tuning the quantum confinement (perovskite nanocrystals) and coherence (multidimensional perovskites) effects of perovskite materials to retard the hot carrier cooling dynamics
  2. Incorporating appropriate hot and cold carrier extraction materials into a single layer to effectively extract both hot and cold carriers to minimize the hot carrier cooling loss and simultaneously ensure efficient cold carrier extraction.

As such, the typically PCE (25.2%) could be further improved to even exceed the maximum SQ limit (≈33%). The cost of PSCs could potentially be reduced by ≈31%, and thus the competitiveness of PSCs in photovoltaic industry would be greatly enhanced.


Perovskite or other photovoltaic materials based photovoltaic industry


Market Trends & Opportunities

Favorable government initiatives toward increasing the deployment of renewable energy sources coupled with stringent regulatory measures to limit carbon emissions will drive the solar cells market growth. As per the United Nations, Vietnam has set targets to triple its renewable power generation from 58 billion kWh in 2015 to 101 billion by 2020 and 186 billion by 2030. Ongoing technological developments to reduce the overall cost of the solar systems in conjunction with robust growth in the PV capacities globally will fuel the product demand.

Shifting trends toward decentralized & variable power generation across emerging economies along with rising measures toward rural electrification will boost the market size. In addition, cost efficiencies, technological innovations and positive end user inclination toward clean energy sources are some of the vital factors that will spur the product adoption. Their noise & emission free operations make them suitable for commercial, residential and industrial installations, thereby fostering the industry growth.


Compared with conventional PSCs, the developed hot-carrier PSCs can efficiently minimize the hot carrier cooling loss and potentially improve the PCE of state-of-the-art PSCs to exceed the maximum SQ limit (≈33%). The related cost of PSCs could potentially be reduced by ≈31%, which would greatly enhance the competitiveness of PSCs in photovoltaic industry and expand its commercialization.


  • A high-performance hot-carrier solar cell construction, which can effectively minimize the hot carrier cooling loss, improve the PCE of PSCs to exceed the maximum SQ limit (≈33%), and potentially reduce the cost by ≈31%.
  • The readily developed production equipment for conventional PSCs is also applicable for fabrication of the hot-carrier solar cells.
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