Samples | M_{n,P4VP}*(kg/mol) | M_{n,PtBA}^{†}(kg/mol) | M_{n,PS}^{‡}(kg/mol) | M_{n,PEO}^{§} (kg/mol) | PDI^{§} | Dimensions of MAPbBr_{3}/SiO_{2} core/shellNCs (core diameter/shell thickness)^{║} (nm) |

Sample A | 8000 | 14,600 | – | 5000 | 1.15 | 6.1 ± 0.3/8.9 ± 0.4 |

Sample B | 9300 | 21,600 | – | 5000 | 1.18 | 8.0 ± 0.3/9.8 ± 0.4 |

Sample C | 8500 | 13,800 | 5,000 | – | 1.19 | 6.8 ± 0.3/8.0 ± 0.3 |

Sample D | 7800 | 15,600 | 10,000 | – | 1.19 | 6.0 ± 0.4/8.9 ± 0.5 |

*Number average MW of the inner P4VP block (*M*_{n,P4VP}) was calculated from ^{1}H NMR data. The calculation method was adapted from a previous work (*33*).

†Number average MW, *M _{n}* of each P

‡Number average MW of the outer PS block was calculated from ^{1}H NMR data based on the following equation *M*_{n,PS}, *M*_{n,PtBA}, and *M*_{n,P4VP} are the MWs of the outer PS block, intermediate P*t*BA block, and inner P4VP block, respectively. *A _{a}* and

§PDI was recorded by DMF GPC.

**║**The core diameter and shell thickness of core/shell NCs were determined by performing image analysis on TEM images of MAPbBr_{3}/SiO_{2} core/shell NCs.