Chou, Li HuiLi HuiChouChen, FengkunFengkunChenNakano, KyoheiKyoheiNakanoYamanaka, KodaiKodaiYamanakaMikie, TsubasaTsubasaMikieSaito, MasahikoMasahikoSaitoCHENG-LIANG LIUTajima, KeisukeKeisukeTajimaOsaka, ItaruItaruOsaka2024-03-192024-03-192024-03-082637-61052637-6105https://scholars.lib.ntu.edu.tw/handle/123456789/641108Achieving a good balance between the crystallinity and solubility is of great importance in the design of π-conjugated polymers. Here, we synthesized a series of terpolymers in which small fractions of a planar V-shaped fused ring, triphenyleno[1,2-c:7,8-c′]bis([1,2,5]thiadiazole) (TPTz), are incorporated into the linear-shaped backbone of a highly crystalline polymer based on naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole) (NTz), PNTz4T. Due to the “bending” structure induced by the TPTz unit, the terpolymers had greatly improved solubility by about 5-9 times compared to the linear-shaped PNTz4T. In particular, the terpolymers preserved the crystallinity of PNTz4T to a considerable extent with a higher fraction of face-on oriented domains in films. As a result, the highly solution-processable terpolymers exhibited high photovoltaic performances and slightly outperformed PNTz4T. Our results indicate that the incorporation of a V-shaped unit into a linearly shaped polymer is a good strategy to develop π-conjugated polymers with high solubility and crystallinity.crystallinity | nonfullerene | organic photovoltaics | organic semiconductors | solubility | π-conjugated polymers[SDGs]SDG7journal article10.1021/acsapm.3c027722-s2.0-85186101276https://api.elsevier.com/content/abstract/scopus_id/85186101276