Factors that Limit Continuous‐Wave Lasing in Hybrid Perovskite Semiconductors,Advanced Optical Materials

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Factors that Limit Continuous‐Wave Lasing in Hybrid Perovskite Semiconductors
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-11-18 , DOI: 10.1002/adom.201901514
Yufei Jia ₁ , Ross A. Kerner ₂ , Alex J. Grede ₁ , Barry P. Rand _{2,

3} , Noel C. Giebink ₁

Affiliation

Metal halide perovskites are a promising platform for solution‐processed semiconductor lasers but have so far only achieved continuous‐wave (cw) operation at low temperature. Here, the origin of this limitation is investigated in prototypical methylammonium lead iodide (MAPbI₃) distributed feedback (DFB) lasers and is found to stem from a combination of pump‐induced heating and the accumulation of photoinduced defects. A temperature rise of more than 30 K in the first few hundred ns following pump turn‐on is observed, which leads to a dynamic increase in threshold owing to the strong temperature dependence of stimulated emission in MAPbI₃ thin films. In parallel, it is found that the Shockley–Read–Hall rate coefficient increases by an order of magnitude on a similar timescale, suppressing the carrier density generated by the pump. The combined impact of both effects is understood using a comprehensive model that quantitatively explains the duration of lasing as a function of pump intensity and predicts that the threshold of current DFB lasers must be decreased by an order of magnitude to achieve cw operation at room temperature.

中文翻译：

限制混合钙钛矿半导体中连续波激光发射的因素

金属卤化物钙钛矿是用于固溶处理半导体激光器的有前途的平台，但迄今为止仅能在低温下实现连续波（cw）操作。在此，对这种限制的根源在典型的甲基铵碘化铅（MAPbI ₃）分布反馈（DFB）激光器中进行了研究，发现其源于泵激加热和光致缺陷积累的结合。在泵开启后的最初几百纳秒内，观察到温度升高超过30 K，由于MAPbI ₃中受激发射的强烈温度依赖性，导致阈值动态增加。薄膜。同时，发现在相似的时间尺度上，Shockley-Read-Hall速率系数增加了一个数量级，从而抑制了泵产生的载流子密度。可以使用一个综合模型来理解这两种效应的综合影响，该模型定量地解释了激射的持续时间与泵浦强度的关系，并预测当前DFB激光器的阈值必须降低一个数量级才能在室温下实现连续工作。

更新日期：2020-01-17

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