光谱学
声子
原子物理学
激子
吸收光谱法
吸收(声学)
单色
量子效率
重组
载流子
量热计(粒子物理)
材料科学
杂质
分子物理学
化学
光电子学
物理
光学
凝聚态物理
探测器
生物化学
量子力学
复合材料
基因
有机化学
作者
D. Bimberg,A. Bubenzer
摘要
A new, simple and highly sensitive spectroscopic method, calorimetric absorption spectroscopy (CAS), for direct detection of phonons emitted via nonradiative recombination processes of charge carriers bound to defects or impurities in solids is demonstrated. Electronic levels of these centers are populated by resonant excitation with monochromatic light. The phonons emitted during recombination are detected with a low-temperature calorimeter with a sensitivity of ≊10−12 J. Thus absorption coefficients as low as ≊10−7 cm−1 and quantum efficiencies can be determined without using radiation detectors. CAS spectra of N- and S-doped GaP are presented, and the low-temperature internal quantum efficiency of the nitrogen bound exciton is found to be close to 100%.
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