A study of the piezoelectric properties of semipolar 112̅2 GaN/AlN quantum dots. Issue 10 (14th July 2015)

• Record Type: Journal Article
• Authors: Young, T. D.; Jurczak, G.; Lotsari, A.; Dimitrakopulos, G. P.; Komninou, Ph.; Dłużewski, P.
• Is Part Of: Physica status solidi. Volume 252:Issue 10(2015:Oct.)
• Page Start: 2296
• Page End: 2303
• Publication Date: 2015-07-14
• Subjects: Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.201552156
• Languages: English
• ISSNs: 0370-1972

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="pssb201552156-sec-0001" sec-type="section"> <p>GaN quantum dots grown in (<inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgkfprqt9r" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552156:pssb201552156-math-0168" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>11</mml:mn><mml:mover accent="true"><mml:mn>2</mml:mn><mml:mo stretchy="true">̅</mml:mo></mml:mover><mml:mn>2</mml:mn></mml:mrow></mml:math></alternatives></inline-formula>)'orientated AlN are studied. The <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgkfprrzwx" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552156:pssb201552156-math-0001" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo stretchy="false">(</mml:mo><mml:mn>11</mml:mn><mml:mover accent="true"><mml:mn>22</mml:mn><mml:mo>‾</mml:mo></mml:mover><mml:mo stretchy="false">)</mml:mo></mml:math></alternatives></inline-formula>‐nucleated quantum dots exhibit rectangular‐ or trapezoid‐based truncated pyramidal morphology. Another quantum dot type orientated on <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgkfprrztw" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552156:pssb201552156-math-0002" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo stretchy="false">(</mml:mo><mml:mn>10</mml:mn><mml:mover accent="true"><mml:mn>11</mml:mn><mml:mo>‾</mml:mo></mml:mover><mml:mo stretchy="false">)</mml:mo></mml:math></alternatives></inline-formula> is reported. Based on high‐resolution transmission microscopy and crystal symmetry, the geometry of <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgkfprs01x" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552156:pssb201552156-math-0003" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo stretchy="false">(</mml:mo><mml:mn>10</mml:mn><mml:mover accent="true"><mml:mn>11</mml:mn><mml:mo>‾</mml:mo></mml:mover><mml:mo stretchy="false">)</mml:mo></mml:math></alternatives></inline-formula>‐orientated quantum dots is proposed. A piezoelectric model is used within a finite element method to determine and compare the strain‐state and electrostatic potential associated with the quantum dot morphology and an estimation of the band‐edge energy is made. We report on some novel properties of the <inline-formula><alternatives><inline-graphic mimetype="image" xlink:href="ark:/27927/pgkfprrzzz" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><mml:math altimg="urn:x-wiley:15213951:media:pssb201552156:pssb201552156-math-0004" display="inline" overflow="scroll" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo stretchy="false">(</mml:mo><mml:mn>10</mml:mn><mml:mover accent="true"><mml:mn>11</mml:mn><mml:mo>‾</mml:mo></mml:mover><mml:mo stretchy="false">)</mml:mo></mml:math></alternatives></inline-formula>‐orientated quantum dot, including mixed strain‐states and strain‐state bowing.</p> </sec> </abstract>