Ubushakashatsi bushya bw'itsinda rya Kaminuza ya Wuhan: imikorere myiza ya Mini LED itukura yiyongereyeho 30%

Vuba aha, itsinda rya Zhou Shengjun ryo muri Kaminuza ya Wuhan ryakoze urwego rushya rwa Schottky-contact intrinsic current blocking layer (SCBL), rushobora kongera ikwirakwira ry'umuyoboro w'amashanyarazi mu gace karimo gukora. No kunoza imikorere myiza yo gukuramo urumuri rwa AlGaInP red. Itara rito rya LED(LEE).

Ishusho iri hejuru igaragaza (a) imiterere y'igikoresho, na (b) inzira yo kugikora ishingiye ku miterere y'urumuri rutukura rwa AlGaInP Itara rito riyobora hamwe na SCBL. (c) SCBL na (d) imiterere y'urumuri rutukura rushingiye kuri AlGaInP ihagaze neza.mikorosikopiamashusho.

Umuyobozi w’ubushakashatsi Shengjun Zhou yavuze ko itsinda ryakoresheje imiterere ya Schottky hagati ya indium tin oxide (ITO) na p-GaP, ndetse n’imiterere ya ohmic hagati ya ITO na p-GaP+ kugira ngo bubake SCBL, ibi bikaba byaragaragajwe n’uburyo bwo kohereza uburebure.

Zhou Shengjun yavuze ko SCBL ishobora kugabanya neza ubwinshi bw'amashanyarazi akikije electrode ya p no guteza imbere ubwinshi bw'amashanyarazi akwirakwira, bityo bikanoza imikorere myiza yo gukura urumuri rwa AlGaInP Mini LED itukura. Bitewe no kwiyongera kw'ubwinshi bw'amashanyarazi n'ubwinshi bw'amashanyarazi akwirakwira, Mini LED zifite SCBL zigaragaza ubwinshi bw'amashanyarazi akwirakwira, imbaraga nyinshi zo gutanga urumuri, ndetse n'ubushobozi bwo kongera ubwinshi bw'amashanyarazi aturuka hanze (EQE).

AlGaInP Mini LED itukura ikoreshwa cyane nk'igice cy'ingenzi cy'amabara yuzuye ibyerekanwa bitewe n'urumuri rwayo rwinshi, ikoreshwa ry'ingufu nke kandi ikaba imara igihe kirekire.

Ariko, kwiyongera k'umuyoboro w'amashanyarazi ku ruhande rwa electrode ya p bituma habaho gukwirakwira kw'umuyoboro w'amashanyarazi mu gace gakora. Byongeye kandi, kubera ko fotoni nyinshi zikorerwa mu gace gakora zinjira cyangwa zigashyirwa ahagaragara na electrode ya p y'icyuma idasobanutse, ubushobozi bwo gukuramo urumuri (LEE) bwa Mini LED ishingiye kuri AlgainP ni buke.

Kugira ngo bakemure iki kibazo, abashakashatsi bashyizeho SCBL kugira ngo banoze uburyo umuriro ukwirakwira no gukura urumuri rwa za electrode za Mini LED zishingiye kuri AlgainP. Bakoresheje uburyo bwa Schottky hagati ya ITO na P-gap, SCBL ishobora gukumira ko umuriro ukomeza kwiyongera hafi ya electrode ya p. Umuriro ushyirwa mu gace gakora unyuze mu gice cy’urukiramende cya P-GAP + ohmic kugira ngo hirindwe ko urumuri rushobora kwinjiza no kugaragara neza na electrode ya p y’icyuma idasobanutse.

Ibisubizo byagaragaje ko ubushobozi bwo gukoresha quantum efficiency (EQE) bwa AlGaInP Mini LED ikoresha SCBL bushobora kwiyongeraho kugeza kuri 31.8% ku muvuduko wa 20mA ugereranije na AlGaInP Mini LED ikoresha SCBL idafite SCBL. Kubwibyo, ikoranabuhanga rya SCBL ryitezweho gukoreshwa mu gukora cyane kwa Mini LED itukura ikoresha AlgainP mu gihe kizaza.

Ni ngombwa kumenya ko itsinda rya Zhou Shengjun ryo muri Kaminuza ya Wuhan ryasohoye kandi ibisubizo bishya byinshi by’ubushakashatsi bwa LED. Urugero, mu bijyanye n’amatara ya ultraviolet yimbitse, itsinda ryashyize ahagaragara uburyo bwa Algan-based ultra-thin tunnel junction (26 nm) muri LED ya ultraviolet yimbitse, byongereye ubushobozi bwo guhindura amashanyarazi ya LED ya ultraviolet yimbitse ku kigero cya 5.5%.

Mu rwego rwa Mini LED, itsinda ryanoje imikorere ya chips za Mini LED zikozwe mu bururu n'icyatsi kibisi bakoresheje Full-angle Distributed Bragg Reflector (DBR). Mu gihe cy'umuvuduko wa 10mA injection, imbaraga z'amashanyarazi za Mini LED z'ubururu n'icyatsi kibisi zishingiye kuri ITO/DBR zongeweho hafi 7.7% na 7.3%, uko bikurikirana.