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P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Related Experiment Video

Updated: Sep 23, 2025

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Published on: January 10, 2017

Polyselenopheno[3,4-b]selenophene for Highly Efficient Bulk Heterojunction Solar Cells.

Haythem A Saadeh^1,2, Luyao Lu¹, Feng He¹

¹Department of Chemistry and The James Franck Institute, The University of Chicago, 929 East 57th Street, Chicago, Illinois 60637, United States.

ACS Macro Letters

|May 17, 2022

Summary

New selenium-containing copolymers achieved 6.87% power conversion efficiency in organic solar cells. These materials offer lower band gaps and enhanced charge mobility compared to thiophene analogs.

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Last Updated: Sep 23, 2025

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Published on: January 10, 2017

Developing High Performance GaP/Si Heterojunction Solar Cells

Developing High Performance GaP/Si Heterojunction Solar Cells

Published on: November 16, 2018

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Published on: January 29, 2017

Area of Science:

Materials Science
Organic Electronics
Polymer Chemistry

Background:

Organic solar cells (OSCs) are a promising renewable energy technology.
Developing novel donor materials with high performance is crucial for advancing OSCs.
Selenophene-based polymers offer unique electronic properties for photovoltaic applications.

Purpose of the Study:

To synthesize and characterize a new series of copolymers containing selenopheno[3,4-b]selenophene and benzodiselenophene units.
To evaluate the performance of these copolymers in bulk heterojunction (BHJ) solar cells.
To compare the properties of the novel selenium-based copolymers with their thiophene analogues.

Main Methods:

Synthesis of polyselenophene-co-benzodiselenophene copolymers (PSeBx).
Fabrication and characterization of BHJ solar cells using PSeB2 as the donor material blended with PC71BM.
Device performance testing, including power conversion efficiency (PCE) measurements.
Analysis of material properties such as band gap and charge carrier mobility.

Main Results:

A new series of copolymers (PSeBx) were successfully synthesized.
The copolymer PSeB2 demonstrated a high PCE of 6.87% in a PSeB2/PC71BM BHJ solar cell.
PSeB2 exhibited a lower band gap and significantly improved charge carrier mobility (1.35 × 10^-3 cm^2 V^-1 s^-1) compared to its thiophene analogue PTB9.

Conclusions:

The synthesized selenophene-based copolymers show great potential as donor materials for high-efficiency organic solar cells.
Incorporating selenophene units into polymer backbones can effectively tune electronic properties and enhance device performance.
Further research into selenophene-containing polymers could lead to next-generation photovoltaic technologies.