A series of highly sensitive polymer photodetectors（PPDs） was fabricated with P3HT100-x：PBDT-TS1x：PC71BM1 as the active layers, where x represents the PBDT-TS1 doping weight ratio in donors. The response range of ...A series of highly sensitive polymer photodetectors（PPDs） was fabricated with P3HT100-x：PBDT-TS1x：PC71BM1 as the active layers, where x represents the PBDT-TS1 doping weight ratio in donors. The response range of PPDs can cover from the UV to near-infrared regions by adjusting the PBDT-TS1 doping weight ratio. The best external quantum efficiency（EQE） values of ternary PPDs with P3HT：PBDT-TS1：PC（71）BM（50：50：1 wt/wt/wt） as the active layers reach 830%, 720%,and 330% under 390-, 625-, and 760-nm light illumination and-10 V bias, respectively. The large EQE values indicate that the photodetectors utilise photomultiplication（PM）. The working mechanism of PM-type PPDs can be attributed to interfacial trap-assisted hole tunnelling injection from the external circuit under light illumination. The calculated optical field and photogenerated electron volume density in the active layers can well explain the EQE spectral shape as a function of the PBDT-TS1 doping weight ratio in donors.展开更多
基金supported by the Fundamental Research Funds for the Central Universities,China(2013JBZ004)Beijing Natural Science Foundation,China(2122050)National Natural Science Foundation of China(613770029)~~
文摘使用二苯甲酰甲烷-二苯菲罗啉-铕(Eu(DBM)3BPhen)作为电子给体和[6,6]-苯基-C61-丁酸酸甲酯([60]PCBM)作为电子受体制备了一种新型的有机光盲型紫外探测器.在光强为2.1 mW cm-2且波长为360 nm的紫外光照射下,获得了26 mA W-1的响应度和9.1%的外量子效率,这是由于Eu(DBM)3BPhen的强紫外光吸收能力和长达300μs的激子寿命使得给受体界面处具有较高的激子解离率.在把[60]PCBM掺入Eu(DBM)3BPhen后,观察到了明显的光致发光猝灭和光电导现象.由于材料较低的载流子迁移率和受陷激子的缓慢释放,在紫外光照射关闭后,观察到了较强的持续光电导现象.
基金supported by the Fundamental Research Funds for the Central Universities of China(Grant No.2014JBZ017)the National Natural Science Foundation of China(Grant Nos.61377029 and 61675017)
文摘A series of highly sensitive polymer photodetectors（PPDs） was fabricated with P3HT100-x：PBDT-TS1x：PC71BM1 as the active layers, where x represents the PBDT-TS1 doping weight ratio in donors. The response range of PPDs can cover from the UV to near-infrared regions by adjusting the PBDT-TS1 doping weight ratio. The best external quantum efficiency（EQE） values of ternary PPDs with P3HT：PBDT-TS1：PC（71）BM（50：50：1 wt/wt/wt） as the active layers reach 830%, 720%,and 330% under 390-, 625-, and 760-nm light illumination and-10 V bias, respectively. The large EQE values indicate that the photodetectors utilise photomultiplication（PM）. The working mechanism of PM-type PPDs can be attributed to interfacial trap-assisted hole tunnelling injection from the external circuit under light illumination. The calculated optical field and photogenerated electron volume density in the active layers can well explain the EQE spectral shape as a function of the PBDT-TS1 doping weight ratio in donors.
