Segregation is a phenomenon of inhomogeneous distribution of constituent elements during crystallization and could be found in alloy, polymers, colloid, etc. Some researchers have also found component segregation in perovskite crystals. Until now, the existing research reports are all about the halogen segregation of perovskite at the micro level, while the research about the component segregation of perovskite at the macro level is blank, leaving no relevant application developed. Therefore, we can broaden the PUFs-based application of perovskite crystals by employing the multi-wavelength emission property arising from component macrosegregation. We synthesized perovskite crystal arrays with macroscopic composition segregation in one step by surface-tension-confined evaporative self-assembly. The macrosegregation in perovskite crystals prepared with different halogen ratios and temperature was surveyed. The photoluminescence spectra of perovskite crystals were investigated. Perovskite crystals with composition segregation could generate physically unclonable cryptographic primitives, which were made by a simple and random process and difficult to replicate. According to the number of peaks in the spectrum, we converted the optical response into quaternary cryptographic keys, and demonstrated the randomness and stability of the system. This study excavated the application prospect of macroscopic component segregation perovskite in all-photonic cryptographic primitives.

偏析是结晶过程中组成元素分布不均匀的现象，可以在合金、聚合物、胶体等中发现。一些研究人员也在钙钛矿晶体中发现了成分偏析。迄今为止，现有的研究报告都是关于钙钛矿在微观层面的卤素偏析，而在宏观层面对钙钛矿成分偏析的研究是空白的，没有开发出相关的应用。因此，我们可以通过利用组分宏观偏析产生的多波长发射特性来拓宽基于 PUF 的钙钛矿晶体的应用。我们通过表面张力限制的蒸发自组装一步合成了具有宏观成分偏析的钙钛矿晶体阵列。考察了不同卤素比和温度制备的钙钛矿晶体的宏观偏析。研究了钙钛矿晶体的光致发光光谱。具有成分分离的钙钛矿晶体可以产生物理上不可克隆的密码原语，这些原语是通过简单和随机的过程制成的，难以复制。根据光谱中峰值的数量，我们将光响应转换为四进制密钥，证明了系统的随机性和稳定性。本研究挖掘了宏观成分分离钙钛矿在全光子密码原语中的应用前景。具有成分分离的钙钛矿晶体可以产生物理上不可克隆的密码原语，这些原语是通过简单和随机的过程制成的，难以复制。根据光谱中峰值的数量，我们将光响应转换为四进制密钥，证明了系统的随机性和稳定性。本研究挖掘了宏观成分分离钙钛矿在全光子密码原语中的应用前景。具有成分分离的钙钛矿晶体可以产生物理上不可克隆的密码原语，这些原语是通过简单和随机的过程制成的，难以复制。根据光谱中峰值的数量，我们将光响应转换为四进制密钥，证明了系统的随机性和稳定性。本研究挖掘了宏观成分分离钙钛矿在全光子密码原语中的应用前景。