Source: riken.jp
Teknoloji chalè-retresibl devlope pa yon ekip tout-RIKEN te kapab pèmèt selil solè yo ak detèktè manyen yo tache ak objè ki gen fòm ki fè yo difisil plastifye1.
Recent studies have indicated that curved solar-cell panels capture sunlight more efficiently than flat ones on cloudy days. One way to produce curved electronics is with rubber-like substrates, but solar cells on such substrates usually have much lower performance. In contrast, solar cells fabricated on flexible sheets have high efficiency, but can be difficult to attach to curved surfaces —a fact that anyone who has tried to gift wrap a soccer ball can attest to.
Chèchè ki te dirije pa Takao Someya nan Sant RIKEN pou Syans Matyè Ijans yo te reyalize ke pwoblèm sa a ta ka simonte lè l sèvi avèk fim chalè-retresi yo, ki souvan itilize pou ankapsile pwodwi tankou sou-la{{2}. }kontre medikaman. Pandan ke pifò elektwonik yo twò rijid oswa frajil yo dwe tache ak fim retresi, ekip la espesyalize nan pwodwi aparèy ultrathin ak pwopriyete inik.
"When a material becomes thinner, it becomes more flexible—that's why we can crumple aluminum foil by hand, but can also use aluminum to make bicycles," explains postdoctoral researcher Steven Rich. "Although we use rigid materials such as metals and plastics, they are three times thinner than a grocery bag and can bend very sharply without breaking."
Rich and three RIKEN colleagues attached a non-stretchable but flexible polymer sheet to a shrink film, then used microscopy to observe the layered structure during various exposures to heat. These tests revealed that, as the device's area shrank by up to 70 percent , the ultrathin sheets relieved the strain of compression by forming tiny wrinkles and folds.
By controlling the size of these wrinkles and choosing materials capable of surviving both heat and severe wrinkling, the RIKEN team found they could shrink prefabricated organic photovoltaic modules onto round objects (Fig. 1) as well as ones with sharp angles and irregular curvatures, including plastic rocks and traditional Japanese Daruma dolls.
Malgre ke chèchè yo te antisipe ke réduction ta ka domaje eleman fotovoltaik yo epi redwi pèfòmans aparèy, opoze a te fèt. Eksperyans yo te montre pwopriyete fotonik estrikti rid ki te pwovoke retresi yo te amelyore absòpsyon limyè, sa ki te ogmante efikasite konvèsyon pouvwa jiska 17 pousan sou aparèy plan.
The team also used shrink wrapping to laminate the handle of a teacup with an electronic touch sensor—a delicate feat that serves as an example of how this technology could be widely applied. "We could incorporate sensors along with displays, power-generation systems, and transistors to create interactive interfaces," Rich says.
