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All-Perovskite Tandem Solar Cell Achieves 30.2% Efficiency at University of Tokyo

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Apr 25, 2026

All-Perovskite Tandem Solar Cell Achieves 30.2% Efficiency at University of Tokyo

Scientists from the University of Tokyo in Japan have developed an all-perovskite tandem solar cell that reaches 30.2% efficiency, as detailed in a study published in ACS Omega. The four-terminal device employs FAPbI3 nanoparticles along with a spectral splitting configuration, integrating a top cell with a 24.4% efficiency wide-bandgap and a bottom cell with a 21.5% efficiency narrow-bandgap.

This setup enhances light utilization by channeling various wavelengths to the most suitable subcells. The top cell is constructed on a glass and fluorine-doped tin oxide (FTO) substrate, featuring a tin oxide (SnO2) hole transport layer, the perovskite absorber, a Spiro-OMeTAD electron transport layer, and a gold metal contact. The bottom inverted cell uses a glass and FTO substrate, a Spiro-OMeTAD electron transport layer, the perovskite absorber, a buckminsterfullerene (C60) hole transport layer, a bathocuproine (BCP) buffer layer, and a silver metal contact.

FAPbI3 is commonly utilized in high-efficiency perovskite solar cells due to its bandgap of roughly 1.48 eV, which is near the optimal value for solar energy conversion. It facilitates strong light absorption and has enabled power conversion efficiencies exceeding 25% in experimental devices. However, a significant drawback is that the desired black alpha-phase is metastable and can degrade into a non-functional yellow phase, altering the material from a light-absorbing semiconductor into a wide-bandgap, inactive phase.

To counter this issue, the Japanese team employed FAPbI3 nanoparticles that were pre-synthesized using a hot injection method. The perovskite films were created through a solution spin-coating process on cleaned and UV-ozone-treated substrates in an inert environment. A precursor solution was made by dissolving PbI2 and formamidinium iodide (FAI) in a mixed solvent of dimethylformamide and dimethyl sulfoxide (DMF/DMSO), stirred until completely uniform. This solution was then spin-coated onto the substrates, followed by controlled thermal annealing to trigger crystallization, transforming the liquid precursor into a dense, crystalline FAPbI3 thin film with the desired photoactive alpha-phase.

Under standard testing conditions, the four-terminal tandem cell achieved a peak power conversion efficiency of 30.2%. The optimal performance occurred at a split wavelength of 775 nm, where the wide-bandgap top cell contributed 24.1% and the narrow-bandgap bottom cell added 6.1%. This wavelength aligns closely with the absorption edge of the top cell, allowing near-complete use of its spectral range. Beyond 775 nm, the top cell sees only a minor current increase, while the bottom cell experiences a much larger photocurrent loss, diminishing overall gains.

Corresponding author Satoshi Uchida noted that the primary benefit of spectral split two-junction, four-terminal solar cells is their capacity to cut losses from spectral mismatch while maintaining high efficiency. This is achieved by directing incoming light to the most appropriate subcell based on its wavelength. Additionally, the four-terminal design removes the need for current matching, enabling flexible combinations of solar cells with diverse compositions. If one subcell fails, the other can still produce power, offering a maintenance advantage.

For real-world application, conventional outdoor photovoltaic systems and integration with concentrator photovoltaics are seen as especially promising for this concept. Nevertheless, the high expense of dichroic mirrors required for spectral splitting remains a hurdle. Future practical deployment will require not only building on these findings but also investigating simpler designs, such as monolithic two-junction two-terminal devices and mechanically stacked two-junction four-terminal devices.

1. INTRODUCTION

Making Data-Driven Decisions to Grow Your Business
1. REPORT DESCRIPTION
2. RESEARCH METHODOLOGY AND THE AI PLATFORM
3. DATA-DRIVEN DECISIONS FOR YOUR BUSINESS
4. GLOSSARY AND SPECIFIC TERMS
2. EXECUTIVE SUMMARY

A Quick Overview of Market Performance
1. KEY FINDINGS
2. MARKET TRENDS This Chapter is Available Only for the Professional EditionPRO
3. MARKET OVERVIEW

Understanding the Current State of The Market and its Prospects
1. MARKET SIZE: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
2. CONSUMPTION BY COUNTRY: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
3. MARKET FORECAST TO 2035
4. MOST PROMISING PRODUCTS FOR DIVERSIFICATION

Finding New Products to Diversify Your Business
1. TOP PRODUCTS TO DIVERSIFY YOUR BUSINESS
2. BEST-SELLING PRODUCTS
3. MOST CONSUMED PRODUCTS
4. MOST TRADED PRODUCTS
5. MOST PROFITABLE PRODUCTS FOR EXPORT
5. MOST PROMISING SUPPLYING COUNTRIES

Choosing the Best Countries to Establish Your Sustainable Supply Chain
1. TOP COUNTRIES TO SOURCE YOUR PRODUCT
2. TOP PRODUCING COUNTRIES
3. TOP EXPORTING COUNTRIES
4. LOW-COST EXPORTING COUNTRIES
6. MOST PROMISING OVERSEAS MARKETS

Choosing the Best Countries to Boost Your Export
1. TOP OVERSEAS MARKETS FOR EXPORTING YOUR PRODUCT
2. TOP CONSUMING MARKETS
3. UNSATURATED MARKETS
4. TOP IMPORTING MARKETS
5. MOST PROFITABLE MARKETS
7. PRODUCTION

The Latest Trends and Insights into The Industry
1. PRODUCTION VOLUME AND VALUE: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
2. PRODUCTION BY COUNTRY: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
8. IMPORTS

The Largest Import Supplying Countries
1. IMPORTS: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
2. IMPORTS BY COUNTRY: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
3. IMPORT PRICES BY COUNTRY: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
9. EXPORTS

The Largest Destinations for Exports
1. EXPORTS: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
2. EXPORTS BY COUNTRY: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
3. EXPORT PRICES BY COUNTRY: HISTORICAL DATA (2012–2025) AND FORECAST (2026–2035)
10. PROFILES OF MAJOR PRODUCERS

The Largest Producers on The Market and Their Profiles
11. COUNTRY PROFILES

The Largest Markets And Their Profiles
This Chapter is Available Only for the Professional Edition PRO
1. 11.1
  United States
  - Market Size
  - Production
  - Imports
  - Exports
2. 11.2
  China
  - Market Size
  - Production
  - Imports
  - Exports
3. 11.3
  Japan
  - Market Size
  - Production
  - Imports
  - Exports
4. 11.4
  Germany
  - Market Size
  - Production
  - Imports
  - Exports
5. 11.5
  United Kingdom
  - Market Size
  - Production
  - Imports
  - Exports
6. 11.6
  France
  - Market Size
  - Production
  - Imports
  - Exports
7. 11.7
  Brazil
  - Market Size
  - Production
  - Imports
  - Exports
8. 11.8
  Italy
  - Market Size
  - Production
  - Imports
  - Exports
9. 11.9
  Russian Federation
  - Market Size
  - Production
  - Imports
  - Exports
10. 11.10
  India
  - Market Size
  - Production
  - Imports
  - Exports
11. 11.11
  Canada
  - Market Size
  - Production
  - Imports
  - Exports
12. 11.12
  Australia
  - Market Size
  - Production
  - Imports
  - Exports
13. 11.13
  Republic of Korea
  - Market Size
  - Production
  - Imports
  - Exports
14. 11.14
  Spain
  - Market Size
  - Production
  - Imports
  - Exports
15. 11.15
  Mexico
  - Market Size
  - Production
  - Imports
  - Exports
16. 11.16
  Indonesia
  - Market Size
  - Production
  - Imports
  - Exports
17. 11.17
  Netherlands
  - Market Size
  - Production
  - Imports
  - Exports
18. 11.18
  Turkey
  - Market Size
  - Production
  - Imports
  - Exports
19. 11.19
  Saudi Arabia
  - Market Size
  - Production
  - Imports
  - Exports
20. 11.20
  Switzerland
  - Market Size
  - Production
  - Imports
  - Exports
21. 11.21
  Sweden
  - Market Size
  - Production
  - Imports
  - Exports
22. 11.22
  Nigeria
  - Market Size
  - Production
  - Imports
  - Exports
23. 11.23
  Poland
  - Market Size
  - Production
  - Imports
  - Exports
24. 11.24
  Belgium
  - Market Size
  - Production
  - Imports
  - Exports
25. 11.25
  Argentina
  - Market Size
  - Production
  - Imports
  - Exports
26. 11.26
  Norway
  - Market Size
  - Production
  - Imports
  - Exports
27. 11.27
  Austria
  - Market Size
  - Production
  - Imports
  - Exports
28. 11.28
  Thailand
  - Market Size
  - Production
  - Imports
  - Exports
29. 11.29
  United Arab Emirates
  - Market Size
  - Production
  - Imports
  - Exports
30. 11.30
  Colombia
  - Market Size
  - Production
  - Imports
  - Exports
31. 11.31
  Denmark
  - Market Size
  - Production
  - Imports
  - Exports
32. 11.32
  South Africa
  - Market Size
  - Production
  - Imports
  - Exports
33. 11.33
  Malaysia
  - Market Size
  - Production
  - Imports
  - Exports
34. 11.34
  Israel
  - Market Size
  - Production
  - Imports
  - Exports
35. 11.35
  Singapore
  - Market Size
  - Production
  - Imports
  - Exports
36. 11.36
  Egypt
  - Market Size
  - Production
  - Imports
  - Exports
37. 11.37
  Philippines
  - Market Size
  - Production
  - Imports
  - Exports
38. 11.38
  Finland
  - Market Size
  - Production
  - Imports
  - Exports
39. 11.39
  Chile
  - Market Size
  - Production
  - Imports
  - Exports
40. 11.40
  Ireland
  - Market Size
  - Production
  - Imports
  - Exports
41. 11.41
  Pakistan
  - Market Size
  - Production
  - Imports
  - Exports
42. 11.42
  Greece
  - Market Size
  - Production
  - Imports
  - Exports
43. 11.43
  Portugal
  - Market Size
  - Production
  - Imports
  - Exports
44. 11.44
  Kazakhstan
  - Market Size
  - Production
  - Imports
  - Exports
45. 11.45
  Algeria
  - Market Size
  - Production
  - Imports
  - Exports
46. 11.46
  Czech Republic
  - Market Size
  - Production
  - Imports
  - Exports
47. 11.47
  Qatar
  - Market Size
  - Production
  - Imports
  - Exports
48. 11.48
  Peru
  - Market Size
  - Production
  - Imports
  - Exports
49. 11.49
  Romania
  - Market Size
  - Production
  - Imports
  - Exports
50. 11.50
  Vietnam
  - Market Size
  - Production
  - Imports
  - Exports
LIST OF TABLES
1. Key Findings In 2025
2. Market Volume, In Physical Terms: Historical Data (2012–2025) and Forecast (2026–2035)
3. Market Value: Historical Data (2012–2025) and Forecast (2026–2035)
4. Per Capita Consumption, by Country, 2022–2025
5. Production, In Physical Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
6. Imports, In Physical Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
7. Imports, In Value Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
8. Import Prices, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
9. Exports, In Physical Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
10. Exports, In Value Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
11. Export Prices, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
LIST OF FIGURES
1. Market Volume, In Physical Terms: Historical Data (2012–2025) and Forecast (2026–2035)
2. Market Value: Historical Data (2012–2025) and Forecast (2026–2035)
3. Consumption, by Country, 2025
4. Market Volume Forecast to 2035
5. Market Value Forecast to 2035
6. Market Size and Growth, By Product
7. Average Per Capita Consumption, By Product
8. Exports and Growth, By Product
9. Export Prices and Growth, By Product
10. Production Volume and Growth
11. Exports and Growth
12. Export Prices and Growth
13. Market Size and Growth
14. Per Capita Consumption
15. Imports and Growth
16. Import Prices
17. Production, In Physical Terms: Historical Data (2012–2025) and Forecast (2026–2035)
18. Production, In Value Terms: Historical Data (2012–2025) and Forecast (2026–2035)
19. Production, by Country, 2025
20. Production, In Physical Terms, by Country: Historical Data (2012–2025) and Forecast (2026–2035)
21. Imports, In Physical Terms: Historical Data (2012–2025) and Forecast (2026–2035)
22. Imports, In Value Terms: Historical Data (2012–2025) and Forecast (2026–2035)
23. Imports, In Physical Terms, By Country, 2025
24. Imports, In Physical Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
25. Imports, In Value Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
26. Import Prices, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
27. Exports, In Physical Terms: Historical Data (2012–2025) and Forecast (2026–2035)
28. Exports, In Value Terms: Historical Data (2012–2025) and Forecast (2026–2035)
29. Exports, In Physical Terms, By Country, 2025
30. Exports, In Physical Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
31. Exports, In Value Terms, By Country: Historical Data (2012–2025) and Forecast (2026–2035)
32. Export Prices, By Country: Historical Data (2012–2025) and Forecast (2026–2035)

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All-Perovskite Tandem Solar Cell Achieves 30.2% Efficiency at University of Tokyo

All-Perovskite Tandem Solar Cell Achieves 30.2% Efficiency at University of Tokyo

1. INTRODUCTION

2. EXECUTIVE SUMMARY

3. MARKET OVERVIEW

4. MOST PROMISING PRODUCTS FOR DIVERSIFICATION

5. MOST PROMISING SUPPLYING COUNTRIES

6. MOST PROMISING OVERSEAS MARKETS

7. PRODUCTION

8. IMPORTS

9. EXPORTS

10. PROFILES OF MAJOR PRODUCERS

11. COUNTRY PROFILES

LIST OF TABLES

LIST OF FIGURES

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