Colloidal Quantum Dot Bulk Heterojunction Solids with Near-Unity Charge Extraction Efficiency.

ABSTRACT: Colloidal quantum dots (CQDs) are of interest for optoelectronic applications owing to their tunable properties and ease of processing. Large-diameter CQDs offer optical response in the infrared (IR), beyond the bandgap of c-Si and perovskites. The absorption coefficient of IR CQDs (≈104 cm-1) entails the need for micrometer-thick films to maximize the absorption of IR light. This exceeds the thickness compatible with the efficient extraction of photogenerated carriers, a fact that limits device performance. Here, CQD bulk heterojunction solids are demonstrated that, with extended carrier transport length, enable efficient IR light harvesting. An in-solution doping strategy for large-diameter CQDs is devised that addresses the complex interplay between (100) facets and doping agents, enabl

SUBMITTER: Choi MJ 

PROVIDER: S-EPMC7404161 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature