Metal halide perovskites (MHPs) are being widely studied as a light-absorber for high-efficiency solar cells. With efforts being made throughout the globe, the power conversion efficiency of MHP solar cells has recently soared up to 25.2%. MHPs are now being spotlighted as a next-generation light-emitter as well. Their high color purity and solution-processability are of particular interest for display applications, which in general benefit from wide color gamut and low-cost high-resolution subpixel patterning. For this reason, research activities on perovskite light-emitting diodes (LEDs) are rapidly growing, and their external quantum efficiencies have been dramatically improved to over 20%. As more and more research groups with different backgrounds are working on these perovskite optoelectronic devices, the demand is growing for standard methods for accurate efficiency measurement that can be agreed upon across the disciplines and, at the same time, can be realized easily in the lab environment with due diligence. Herein, optoelectronic characterization methods are revisited from the viewpoint of MHP solar cells and LEDs. General efficiency measurement practices are first reviewed, common sources of errors are introduced, and guidelines for avoiding or minimizing those errors are then suggested to help researchers in fields develop the best measurement practice.

金属卤化物钙钛矿（MHP）作为高效太阳能电池的光吸收剂正在被广泛研究。通过在全球范围内的努力，MHP太阳能电池的功率转换效率最近已飙升至25.2％。现在，MHP也已成为下一代发光体。它们的高色纯度和溶液可加工性特别适合显示应用，这些应用通常受益于宽色域和低成本的高分辨率子像素图案。因此，钙钛矿发光二极管（LED）的研究活动迅速增长，其外部量子效率已显着提高到20％以上。随着越来越多具有不同背景的研究小组在研究这些钙钛矿光电器件，可以在各个学科上达成共识的，用于精确效率测量的标准方法的需求正在增长，与此同时，可以通过尽职调查在实验室环境中轻松实现。在此，从MHP太阳能电池和LED的观点出发，重新讨论了光电表征方法。首先对通用效率测量实践进行了回顾，介绍了常见的误差源，然后提出了避免或减少这些误差的指南，以帮助现场研究人员制定最佳的测量实践。