{"title":"掺杂对光电电池中半导体聚合物聚苯并(1,2-b:4,5-b ')二噻吩-二酮(PBDB-T)光致载流子动力学的影响","authors":"Zhikui Wang, Won Tae Choi","doi":"10.1021/acs.jpclett.5c01241","DOIUrl":null,"url":null,"abstract":"Photoelectrochemical cells based on polymer semiconductors are a viable platform for solar-to-fuel conversion, yet optimizing photogenerated charge transport remains a key challenge. Understanding and controlling these charge carrier dynamics are critical for advancing device efficiency. Here, we report that electrochemical doping of a semiconducting polymer, poly(benzo(1,2-<i>b</i>:4,5-<i>b</i>′)dithiophene-<i>alt</i>-dione) (PBDB-T), effectively enhances photoelectrochemical activity. We systematically investigate the influence of doping species (Cl<sup>–</sup>, Br<sup>–</sup>, and I<sup>–</sup>) on charge carrier dynamics using intensity-modulated photocurrent spectroscopy (IMPS). Our results indicate that (1) all halide dopants accelerate both charge transfer and recombination kinetics, (2) the greater relative increase in the charge transfer rate leads to an overall improvement in charge transfer efficiency, and (3) Cl<sup>–</sup> doping yields the highest photocurrent enhancement, which is attributed to efficient exciton separation. These findings provide valuable insight into how dopant identity influences charge carrier dynamics and offer a strategy for designing high-performance organic photoelectrodes through controlled electrochemical doping.","PeriodicalId":62,"journal":{"name":"The Journal of Physical Chemistry Letters","volume":"520 1","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of Doping on Photoinduced Charge Carrier Dynamics of a Semiconducting Polymer, Poly(benzo(1,2-b:4,5-b′)dithiophene-alt-dione) (PBDB-T), in Photoelectrochemical Cells\",\"authors\":\"Zhikui Wang, Won Tae Choi\",\"doi\":\"10.1021/acs.jpclett.5c01241\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Photoelectrochemical cells based on polymer semiconductors are a viable platform for solar-to-fuel conversion, yet optimizing photogenerated charge transport remains a key challenge. Understanding and controlling these charge carrier dynamics are critical for advancing device efficiency. Here, we report that electrochemical doping of a semiconducting polymer, poly(benzo(1,2-<i>b</i>:4,5-<i>b</i>′)dithiophene-<i>alt</i>-dione) (PBDB-T), effectively enhances photoelectrochemical activity. We systematically investigate the influence of doping species (Cl<sup>–</sup>, Br<sup>–</sup>, and I<sup>–</sup>) on charge carrier dynamics using intensity-modulated photocurrent spectroscopy (IMPS). Our results indicate that (1) all halide dopants accelerate both charge transfer and recombination kinetics, (2) the greater relative increase in the charge transfer rate leads to an overall improvement in charge transfer efficiency, and (3) Cl<sup>–</sup> doping yields the highest photocurrent enhancement, which is attributed to efficient exciton separation. These findings provide valuable insight into how dopant identity influences charge carrier dynamics and offer a strategy for designing high-performance organic photoelectrodes through controlled electrochemical doping.\",\"PeriodicalId\":62,\"journal\":{\"name\":\"The Journal of Physical Chemistry Letters\",\"volume\":\"520 1\",\"pages\":\"\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2025-06-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"The Journal of Physical Chemistry Letters\",\"FirstCategoryId\":\"1\",\"ListUrlMain\":\"https://doi.org/10.1021/acs.jpclett.5c01241\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry Letters","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.jpclett.5c01241","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Effect of Doping on Photoinduced Charge Carrier Dynamics of a Semiconducting Polymer, Poly(benzo(1,2-b:4,5-b′)dithiophene-alt-dione) (PBDB-T), in Photoelectrochemical Cells
Photoelectrochemical cells based on polymer semiconductors are a viable platform for solar-to-fuel conversion, yet optimizing photogenerated charge transport remains a key challenge. Understanding and controlling these charge carrier dynamics are critical for advancing device efficiency. Here, we report that electrochemical doping of a semiconducting polymer, poly(benzo(1,2-b:4,5-b′)dithiophene-alt-dione) (PBDB-T), effectively enhances photoelectrochemical activity. We systematically investigate the influence of doping species (Cl–, Br–, and I–) on charge carrier dynamics using intensity-modulated photocurrent spectroscopy (IMPS). Our results indicate that (1) all halide dopants accelerate both charge transfer and recombination kinetics, (2) the greater relative increase in the charge transfer rate leads to an overall improvement in charge transfer efficiency, and (3) Cl– doping yields the highest photocurrent enhancement, which is attributed to efficient exciton separation. These findings provide valuable insight into how dopant identity influences charge carrier dynamics and offer a strategy for designing high-performance organic photoelectrodes through controlled electrochemical doping.
期刊介绍:
The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.