Our study concentrates on the impact of public research and development (R&D) as solar PV market matures. This paper tried to distinguish the concepts of market maturity and technology maturity and to approach them measurably. Considering the concept of cost reduction rate and number of patent change rate, we estimates maturity indicator respectively. Next, we estimate how market and technology maturity interact with public R&D. Finally, we examine whether the R&D effect varies depending on market maturity. This study suggests the implications of the R&D policy of renewable energy technologies at various maturity levels by making the concept of market maturity which is commonly used and measuring the R&D effect according to market maturity.

我们的研究集中于随着太阳能光伏市场的成熟，公共研发的影响。本文试图区分市场成熟度和技术成熟度的概念，并对其进行可衡量的研究。考虑成本降低率和专利变更率数的概念，我们分别估计成熟度指标。接下来，我们估计市场和技术成熟度如何与公共研发互动。最后，我们研究了研发效果是否根据市场成熟度而变化。这项研究通过提出常用的市场成熟度概念并根据市场成熟度来衡量研发效果，从而提出了不同成熟度水平下可再生能源技术研发政策的含义。