Episode's summary
Perovskite solar cells have promised to push photovoltaic efficiency to new heights for years. Now, with major manufacturers achieving crucial reliability milestones and the first large-format modules entering large-scale production, the technology is moving beyond the laboratory. But as the race to bring perovskites to market accelerates, a fundamental question remains: will production processes deliver on cost, efficiency, and durability? This week, host Jonathan Gifford speaks with two leading manufacturers pursuing different approaches to perovskite-silicon tandem solar technology at the Perovskite Connect 2026 event in Berlin. First, Fabian Fertig, head of R&D PV technology at Qcells, discusses the company's breakthrough in achieving independent certification for its two-terminal tandem modules – a significant step towards commercial viability. Fertig explains why reliability, rather than record-breaking efficiency, has been the real challenge, and how Qcells is preparing to scale production to gigawatt…
Perovskite solar cells have promised to push photovoltaic efficiency to new heights for years. Now, with major manufacturers achieving crucial reliability milestones and the first large-format modules entering large-scale production, the technology is moving beyond the laboratory. But as the race to bring perovskites to market accelerates, a fundamental question remains: will production processes deliver on cost, efficiency, and durability? This week, host Jonathan Gifford speaks with two leading manufacturers pursuing different approaches to perovskite-silicon tandem solar technology at the Perovskite Connect 2026 event in Berlin. First, Fabian Fertig, head of R&D PV technology at Qcells, discusses the company's breakthrough in achieving independent certification for its two-terminal tandem modules – a significant step towards commercial viability. Fertig explains why reliability, rather than record-breaking efficiency, has been the real challenge, and how Qcells is preparing to scale production to gigawatt…
Episodes
Pathways to perovskite commercialization emerge – with Fabian Fertig and Frank Mu
ListenedPerovskite solar cells have promised to push photovoltaic efficiency to new heights for years. Now, with major manufacturers achieving crucial reliability milestones and the first large-format modules entering large-scale production, the technology is moving beyond the laboratory. But as the race to bring perovskites to market accelerates, a fundamental question remains: will production processes deliver on cost, efficiency, and durability? This week, host Jonathan Gifford speaks with two leading manufacturers pursuing different approaches to perovskite-silicon tandem solar technology at the Perovskite Connect 2026 event in Berlin. First, Fabian Fertig, head of R&D PV technology at Qcells, discusses the company's breakthrough in achieving independent certification for its two-terminal tandem modules – a significant step towards commercial viability. Fertig explains why reliability, rather than record-breaking efficiency, has been the real challenge, and how Qcells is preparing to scale production to gigawatt…
New policy reforms could shrink Germany’s solar market – with David Wortmann and Salomé Perperot
ListenedGermany helped pioneer the political frameworks that made solar a global success. But with daytime electricity prices falling, solar companies under pressure, and significant policy reforms taking shape, could the impressive solar and battery installation rates of recent years slow dramatically? This week, host Jonathan Gifford speaks with David Wortmann, founder and CEO of Berlin-based consultancy DWR eco, about the proposed overhaul of Germany’s Renewable Energy Act (EEG). The reforms could fundamentally change the financial returns that solar projects can deliver, with support for residential and commercial rooftops set to shrink. But it’s not all one way; utility-scale tender volumes under the same reforms are likely to increase. Wortmann argues that the main concern may be the speed of the reforms. As solar businesses are pushed towards self-consumption and market-based revenues, it appears that some are struggling to adapt. He discusses whether Germany can strike the right balance between rooftop and…
The challenge in turning Europe’s PV research into an industrial reality – with Gaëtan Masson and Delfina Muñoz
ListenedEurope has some of the world’s best solar researchers and strongest local markets. So why is so much of the PV manufacturing happening somewhere else? Recorded at the recent EU PVSEC scientific conference and exhibition in Rotterdam, host Jonathan Gifford explores this question with Gaëtan Masson, CEO of the Becquerel Institute and co-chair of the European Solar Manufacturing Council. They examine Europe’s increasingly unusual position within the energy transition: a major solar market with very little manufacturing of its own. Meanwhile, India, the U.S. and China are building enormous production capacity – often drawing on European research outcomes. So, can Europe leverage its solar knowhow to rebuild its industry? Masson argues that European-level industrial policy is required – particularly if manufacturers are going to attract the investment needed to scale. Jonathan also speaks with 2026 Becquerel Prize winner Delfina Muñoz, Research Director of the Solar Energy Department at CEA at INES. Much of…
Stack ‘em up: Germany’s big battery inflection point – with Thaddäus Kreisig
ListenedGermany’s utility-scale battery deployment is hitting an inflection point. After years of projects piling up in development pipelines, utility-scale storage is arriving at gigawatt scale – just as Germany’s huge solar fleet drives electricity prices towards zero, or below, during sunny hours. For batteries that can shift that power into higher-priced periods, the opportunity is enormous. Host Jonathan Gifford speaks with Thaddäus Kreisig, Principal at Aurora Energy Research, about Germany’s forming battery boom – and how developers are building revenue stacks to make projects viable. The shift is striking: more than two-thirds of solar developers recently surveyed by Aurora said every project they plan to deploy will be co-located with a battery system. Falling battery-system equipment costs are strengthening the business case, while arbitrage, ancillary services, EEG revenues, and new financing models are opening up ways in which battery energy storage systems can pay off. But grid constraints remain a…
Update on global solar and inside “24/7 renewable Germany” – with Charlotte Senkpiel & Sonia Dunlop
ListenedThe Dunkelflaute has become one of the most persistent arguments against a fully renewable energy system. When the sun isn’t shining and the wind isn’t blowing, where is our energy supposed to come from? Detailed new modeling from Germany’s Fraunhofer ISE suggests these “dark doldrums” are a challenge – but should not be enough to halt the energy transition. The bigger challenge to be overcome is how the flexibility needed to manage low-renewable energy periods can be embedded into the country’s energy system. Recorded at The smarter E Europe 2026 in Munich, host Jonathan Gifford speaks with Fraunhofer ISE senior scientist Charlotte Senkpiel about what it would take for Germany to reach climate neutrality with wind and solar at the heart of its energy system. And the result is not only good for the climate, it’s economically viable. The outcome of the Fraunhofer ISE study goes well beyond simply building more renewables. Batteries, electric vehicles, flexible demand, strengthened and smarter grids,…