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A flexible dye-sensitized solar cell (DSSC) reported in 2012 borrowed a structural idea from traditional Korean doors: a supporting frame paired with a paper-like porous layer. Stainless-steel mesh acted as the frame, while porous glass paper held the electrolyte. The prototype converted light to electricity at a reported 2% efficiency and retained 90% of its flat-form efficiency when bent. Those were research results, not evidence of a product reaching the market.
What Korean doors had to do with a solar cell
The connection was the construction, not the energy source. Traditional Korean doors described by researcher Seung Cha use a wooden frame with traditional paper called Hanji. The cell adapted that frame-and-paper arrangement: stainless-steel mesh took the frame role, and porous glass paper provided a paper-like support. It did not use Hanji.
In Chemistry World’s 19 January 2012 report, Cha explained the inspiration: “The traditional Korean door is a beautiful and interesting internal door that consists of a wooden frame and traditional paper called “Hanji”.” The researchers’ paper was titled “Dye-sensitized Solar Cells on Glass Paper: TCO-free Highly Bendable Dye-sensitized Solar Cells Inspired by Traditional Korean Door Structures.” The Royal Society of Chemistry identified the authors as Seung Il Cha, Yuhyun Kim, Kyu Hyeon Hwang, Yunji Shin, S. H. Seo, and Dong Y. Lee, and listed DOI 10.1039/C2EE03096A in its 20 January 2012 Energy & Environmental Science blog post.
How the cell was built to bend
A conventional DSSC was described in the 2012 coverage as two transparent conductive oxide (TCO)-coated substrates separated by a spacer, leaving room for electrolyte. When bent, the electrodes can experience opposing strain and pull away from the spacer. The Korean-door-inspired design instead placed its functional layers on a porous support, avoiding the conventional two-substrate sandwich described in the report.
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- Stainless-steel mesh was attached to one side of the glass paper.
- A titanium-dioxide photoelectrode was deposited on the mesh.
- Platinum was deposited on the other side of the glass paper.
- Electrolyte occupied pores in the paper.
The porous layer served both as a flexible support and as a place to hold electrolyte. The design also avoided the fragile transparent conductive oxide films discussed in the report. Cha said: “The structure is flexible, and expensive and fragile TCO films are not required.” This does not mean the cell contained no electrodes; its mesh and platinum layers formed part of its construction.
What the 2012 results showed
Chemistry World and the Royal Society of Chemistry reported a measured conversion efficiency of 2% for the prototype. They also reported that the cell retained 90% of its flat-form efficiency when bent. That figure compares the bent configuration with the same cell flat; it is not an efficiency of 90%.
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The same coverage gave historical context: glass-substrate DSSCs were reported above 10% efficiency, while flexible DSSCs using TCO-coated plastic substrates were reported above 5%. These are comparisons from 2012 reporting, not current benchmarks. Michael McGehee, a Stanford University DSSC expert quoted by Chemistry World, noted a challenge with paper-based designs: “Using paper, instead of conventional substrate materials like glass, metal or plastic, is very attractive, but has proven to be difficult because paper is rough.”
Was it efficient enough for commercial use?
Not by the commercial threshold discussed in the 2012 article. Cha said 5% efficiency was needed for commercial applications at the time, and anticipated that the concept might eventually reach 4–5%. That range was a projection, not a later verified result in the sources cited here. The reported prototype’s measured figure remained 2% in the available coverage.
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- 【Industry-leading Tech】The flexible solar panel is equipped with half-cut PERC cell technology that enhances solar light capture and electrical performance, therefore improving the output efficiency.
- 【Reliable and Durable】 This 200w solar panel accomplishes with IP67 rated waterproof junction box and solar connectors. Withstand up to 5400 Pa of heavy snow load and up to 2400 Pa of high wind.
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The team was working to improve efficiency, but the sources do not establish its later performance, commercial availability, or deployment. Chemistry World mentioned advertising and small portable power as possible applications; it did not report that the cell was installed or sold for either use.
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- Lightweight & Easy to Install: It is only 0.1 inches in height and weighs only 4.4LB (2KG), the solar panel is easy to transport, install, hang and remove. The metal pre-drilled holes and PV solar connectors help you install easily and quickly.
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- Waterproof & Dustproof: This flexible solar panel is equipped with IP67-rated junction box to effectively block water splashes and dust from outside, making it perfect to be used outdoors. It is much more durable than traditional glass and aluminum model solar panels. 2 pieces bypass-diodes are built in the junction box.
- Excellent Quality: The flexible solar panel is made of ETFE material, which has a higher light transmission and longer service life than ordinary materials. The back panel is made of TPT, which is good for heat dissipation, waterproof, high temperature resistant and easy to clean.
What the research does—and does not—establish
- Established in the 2012 coverage: a DSSC prototype used stainless-steel mesh, glass paper, platinum, a titanium-dioxide photoelectrode, and electrolyte held in the paper’s pores.
- Reported performance: 2% measured conversion efficiency and 90% of flat-form efficiency retained when bent.
- Not established: that the projected 4–5% efficiency was achieved, that the prototype entered production, or that it became a commercially available product.
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