Do the efficiency gains justify the added cost of a perovskite layer?
Yes, the efficiency gains are substantial enough to offset the added manufacturing complexity. Perovskite-silicon tandems have already achieved certified power conversion efficiencies (PCE) of 33.89% [5], which exceeds the theoretical single-junction silicon limit of ~29%. This means a tandem module can produce significantly more electricity per square meter than a standard silicon panel, directly lowering the levelized cost of electricity (LCOE). For context, a 2022 modeling study predicted that bifacial perovskite-silicon tandems could deliver up to 60% more energy yield than monofacial silicon modules under high-albedo ground conditions [2].
The efficiency gains are not just theoretical lab records. Multiple independent groups have reported certified efficiencies above 30%: 32.5% [4], 31.25% [11], 30.9% [10], and 30.24% [9]. These results come from different device architectures (both two-terminal and four-terminal) and different silicon bottom cells (heterojunction and TOPCon), which strengthens the case that high efficiency is reproducible across approaches.
Can these cells be manufactured at scale and at low cost?
Yes, recent advances directly address the two biggest manufacturing hurdles: processing in air (instead of an inert atmosphere) and using industry-standard textured silicon wafers. A 2024 study demonstrated that using n-Butanol as a solvent allows perovskite films to be fabricated in air with 29.4% efficiency (certified 28.7%) on double-sided textured silicon, and 26.3% on a 16 cm² aperture area [3]. This is critical because textured silicon is the standard in solar manufacturing—it captures more light. Earlier, a 2022 study achieved 28.84% on fully textured, production-line-compatible silicon heterojunction cells [12].
Cost reduction is also being built into the design. A 2023 study showed that using an ultrathin (5 nm) amorphous indium zinc oxide (IZO) interconnecting layer reduces indium consumption by ~80% compared to conventional crystalline TCOs, which is important for sustainable and cost-effective manufacturing [4]. A techno-economic analysis of TOPCon-based tandems (a lower-cost silicon cell type) predicts they can achieve comparable efficiencies to heterojunction-based tandems, and TOPCon's lower fabrication costs may offer critical advantages for mass production [6]. Additionally, modeling work suggests the front transparent conductive oxide (TCO) thickness can be reduced from 75 nm to ~20 nm, saving 1.46 euro cents per cell in material costs [13].
What is the biggest remaining obstacle to commercial viability?
The single biggest obstacle is achieving a 25-year operational lifetime, which is the industry standard for silicon panels. Current lab devices show promising but insufficient stability. The best reported result among these studies is an encapsulated tandem retaining over 80% of its initial efficiency after 2000 hours (about 83 days) of continuous full-sun illumination in ambient conditions [1]. While this is a significant improvement, it is still far short of the 25-year target.
Multiple degradation mechanisms must be solved simultaneously: halide segregation (where the perovskite's mixed-halide composition separates under light), interfacial delamination, and vulnerability to moisture, heat, and UV light [7]. A 2022 study showed that an additive (ammonium diethyldithiocarbamate) can suppress phase segregation and maintain over 90% of initial efficiency after 500 hours of operation [9]. A 2024 review emphasizes that the transition from lab to industry requires not just higher efficiency, but also standardized IEC/ISOS testing protocols and independent validation of long-term reliability [8]. The field is actively working on these issues, but stability remains the primary risk to cost competitiveness.
About These Sources
This answer is built on 13 peer-reviewed studies — published from 2021 to 2026, 6 from 2024 or later, 12 in Q1 journals, collectively cited 2,112 times — selected as the most relevant from 15 studies that passed quality screening, drawn from 54 papers retrieved from a database of over 500 million.
Sources used in this answer
Efficient Perovskite/Silicon Tandem Solar Cells on Industrially Compatible Textured Silicon
Demonstrates 28.6% efficient tandem cells on industrially textured silicon using an anion-engineered additive, with encapsulated devices retaining >80% of initial performance after 2000 hours of operation.
Model‐Chain Validation for Estimating the Energy Yield of Bifacial Perovskite/Silicon Tandem Solar Cells
Models that bifacial perovskite-silicon tandems can deliver up to 60% more energy yield than monofacial silicon modules under high-albedo ground conditions.
Solvent engineering for scalable fabrication of perovskite/silicon tandem solar cells in air
Achieves 29.4% efficiency (certified 28.7%) for double-sided textured tandems fabricated in air using n-Butanol solvent, and 26.3% on a 16 cm² aperture.
Enhanced optoelectronic coupling for perovskite/silicon tandem solar cells
Achieves a certified 32.5% efficiency using ultrathin (5 nm) amorphous IZO interconnects, reducing indium consumption by ~80%.
Perovskite/silicon tandem solar cells with bilayer interface passivation
Reports a certified stabilized efficiency of 33.89% for a perovskite-silicon tandem, the first two-junction cell to exceed the single-junction Shockley-Queisser limit of 33.7%.
TOPCon-based bottom cells for perovskite/silicon tandem solar cells
Reviews TOPCon-based bottom cells for tandems, noting that TOPCon's lower fabrication costs may offer advantages for mass production, though certified efficiencies still lag heterojunction-based tandems.
Key Challenges for Commercializing Perovskite–Silicon Tandem Solar Cells
Identifies key challenges for commercialization including long-term stability, large-area fabrication, and real-world reliability, and proposes a roadmap toward 25-year operational lifetime.
Pathways toward commercial perovskite/silicon tandem photovoltaics
Reviews pathways to commercial perovskite/silicon tandems, emphasizing the need for scalable input materials, stability, reliability, and accurate field-performance prediction.
Phase‐Stable Wide‐Bandgap Perovskites for Four‐Terminal Perovskite/Silicon Tandem Solar Cells with Over 30% Efficiency
Achieves 30.24% efficiency in a four-terminal tandem using an ADDC additive that suppresses phase segregation, with devices retaining >90% of initial PCE after 500 hours of operation.
Synergetic substrate and additive engineering for over 30%-efficient perovskite-Si tandem solar cells
Achieves a certified 30.9% efficiency using pFBPA additive and SiO2 nanoparticles to suppress recombination and pinholes in the perovskite layer.
Interface passivation for 31.25%-efficient perovskite/silicon tandem solar cells
Achieves a certified 31.25% efficiency by using an additive to regulate perovskite crystallization and reduce recombination at the perovskite/C60 interface on micrometric pyramid-textured silicon.
Fully Textured, Production‐Line Compatible Monolithic Perovskite/Silicon Tandem Solar Cells Approaching 29% Efficiency
Achieves a certified 28.84% efficiency on fully textured, production-line-compatible silicon heterojunction cells using a NiOx/2PACz hybrid hole transport layer.
Optimized front TCO and metal grid electrode for module‐integrated perovskite–silicon tandem solar cells
Models that the front TCO thickness can be reduced from 75 nm to ~20 nm for tandems, saving 1.46 euro cents per cell in ITO costs, and that fewer wires can be used for interconnection.